tektronix :: tm500 :: 070-1582-00 AM502 Sep75

IMIX®

INSTRUCTION MANUAL

Tektronix, Inc.

P.O. Box 500

Beaverton, Oregon 97005

Serial Number

070-1582-00

573

WARRANTY

AH TEKTRONIX instruments are warranted against
defective materials and workmanship for one year. Any
questions with respect to the warranty should be taken up
with your TEKTROWlX Field Engineer or representative.

AH requests for repair and replacement parts should be
directed to the TEKTRONIX Field Office or representative
in your area, This will; assure you the fastest possible
service. Please include the instrument Type Number or Part
Number and Serial Number with all requests for part
service.' *:: '.V'cy

Specifications and price change privileges reserved.

Copyright © 1973 by Tektronix, Inc., Beaverton, Oregon.
Printed in the United States of America. All rights reserved.
Contents of this publication may not be reproduced in any
form without permission of Tektronix, Inc.

U.S.A. and Foreign TEKTRONIX products covered by U.S.
and foreign patents and/or patents pending.

TEKTRONIX is a registered trademark of Tektronix, Inc.

AM 502

TABLE
OF CONTENTS

SECTION 1 OPERATING INSTRUCTIONS

Page

SECTION 2 THEORY OF OPERATION (cont) Page

I ntroduction

1-1

Instrument Description

1-1

Installation and Removal

1-1

Instrument Operation

1-2

Input Connections

1-2

Probes

1-2

High Impedance Input

1-2

Input Overloading

1-2

Output Connections

1-2

Step Gain DC Balance

1-2

DC Offset Coarse and Fine

1-2

HF and LF Bandwidth Reduction

1-2

Pre-Charging

1-2

Functions Available at Rear

Connector

1-3

Measurement Techniques

1-3

Single-Ended vs. Differential

Measurements

1-3

Common Mode Rejection Ratio

1-4

Degradation of CMRR

1-5

Specifications

1-6

SECTION 2 THEORY OF OPERATION

Introduction

2-1

Input Coupling

2-1

Input Overdrive Protection

2-1

Gate Current Compensation

2-1

Preamp

2-1

DC Offset

2-1

Input Cross Neutralization

2-1

High Frequency Common-Mode

Balance

2-3

Preamp Output Stage

2-3

LF -3 dB POINT Selector

2-3

Gain Switching Amplifier

2-3

HF -3 dB POINT Selector

2-3

Variable Gain Stage

2-3

Output Amplifier

2-3

Overrange Indicator

2-4

Power Supplies

2-4

SECTION 3 SERVICE INFORMATION

Symbols and Reference Designators 3-1

Electrical Parts List

Internal Adjustment Procedure

Parts Location Grid

Front Panel Controls and Block
Diagram

Preamplifier Schematic

Output Amplifier Schematic

Switch Details Schematic

Power Supplies Schematic

Mechanical Parts List

Exploded View

Accessories and Repackaging

3-2

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TEKTRONIX!? AM 502 DIFFERENTIAL AMPL

AM 502

®

Section 1-AM 502

OPERATING
INSTRUCTIONS

INTRODUCTION

Instrument Description

The AM 502 is a DC-coupled differential amplifier with
excellent common-mode rejection capabilities and high gain
for low-voltage measurements. The DC OFFSET capability
permits nulling up to one volt DC, so that low level, low
frequency signals impressed on a DC level can be amplified
without the degradation often introduced by AC input
coupling.

Installation and Removal

The AM 502 is calibrated and ready for use when
received. It operates in any compartment of a TM 500-
Series Power Module. See the Power Module instruction
manual for line voltage requirements and Power Module
operation. Fig. 1-1 shows the AM 502 installation and
removal procedure.

High and low frequency —3 dB points can be selected at
the front panel to suit the application. Signal inputs and
outputs are available at the rear connector as well as at the
front panel. A front-panel lamp indicates most over-range
conditions of excessive input signal (either differential or
common mode), excessive gain, or excessive offset.

Turn the Power Module off before inserting the plug-
in; otherwise, damage may occur to the plug- in
circuitry.

Check that the AM 502 is fully inserted in the Power
Module. Pull the PWR switch on the Power Module. The
power light on the front panel should now be lit. The
Controls, Connectors and Adjustments foldout page in
Section 3 gives a complete description of the front panel
controls.

Top
roove

Fig, 1-1. AM 502 Installation and Removal.

REV. B,JAN. 1975

1-1

Operating Instructions— AM 502

INSTRUMENT OPERATION

Input Connections

Unshielded test leads can be used to connect the
AM 502 to a signal source when a high-level, low-frequency
signal is monitored at a low impedance point. However,
when any of these factors is missing, it becomes in-
creasingly important to use shielded signal cables. In all
cases, the signal-transporting leads should be kept as short
as practical.

Input Overloading

When measuring unknown DC voltages, push the -f 100
button in, and start with the 100 position on the GAIN
switch. Increase the GAIN switch setting and finally release
the -i- 100 pushbutton until a suitable output signal is
obtained. If the input circuit of the AM 502 is overdriven,
large amounts of current will flow, opening the protective
fuses.

When making single-ended input measurements (conven-
tional amplifier operation), be sure to establish a common
ground connection between the device under test and the
AM 502. The shield of a coaxial cable is normally used for
this purpose. Push the GND button for the input not
connected to the device under test.

Output Connections

Make output connections using a BNC to Dual Binding
Post connector (Tektronix part number 103-0035-00} or
a coaxial cable with at least one BNC connector. To prevent
current limiting in the output stage, do not load the output
with less than 250 £2. Output current is limited to 20 mA.

In some cases differential measurements require no
common chassis ground connection, and therefore are less
susceptible to interference by ground-loop currents.

Consider the change in the source operating character-
istics due to loading by the signal input cables. The circuit
at the input connectors can be represented by approx-
imately 1 MS2 to ground paralleled by approximately
47 pF. Two feet of 50 J2 coaxial cable increases the parallel
capacitance by about 60 pF, which could be excessive in
many situations. To minimize these effects, use a higher
impedance cable or an attenuator probe.

Probes

Attenuator probes decrease the resistive-capacitive
loading of a signal source. They also extend the measure-
ment range of the AM 502 to substantially higher voltages.
The Tektronix P6055 passive probe is designed specifically
for differential applications. Some measurements require a
higher resistance input to the AM 502, with very little
source loading or signal attenuation. In such situations use a
FET probe or the high-impedance input provision of the
AM 502. Contact your Tektronix Representative for
further information on probes.

Step Gain DC Balance

If this control is misad justed, the DC output level will
shift as the GAIN switch position is changed. Push both
GND buttons and place the GAIN switch in the 100
position. Rotate the GAIN switch from stop to stop while
adjusting the STEP GAIN DC BAL control for no DC shift
at the OUTPUT terminal.

DC Offset Coarse and Fine

Use these controls to offset up to ± 1 V DC potential
difference at the input connectors. The amplifier internal
bias is changed to accomplish the offset. The differential
rejection capabilities of the AM 502 are not affected. The
LF-3dB switch must be in the DC OFFSET position to
activate these controls.

HF and LF Bandwidth Reduction

Use the HF -3 dB switch to reduce the upper bandwidth
limit, as necessary, to improve the signal-to-noise ratio
when using the AM 502 in low-frequency applications. The
LF -3 dB control increases the lower bandwidth frequency.
Use this control to reduce DC drift, when raising the lower
bandwidth does not undesirably reduce the bandwidth for
the signal being measured.

High Impedance Input

To raise the internal input impedance of the AM 502 to
about 200 M£2, remove the connectors shown on the
Controls and Adjustments foldout page. Make certain the
attenuator is in the NORM mode. Signal source impedance
now becomes an important factor. For example, a
100 picoampere gate current through 10 megohms pro-
duces a one-millivolt offset. This offset may result in
significant error when small voltages are measured.

Pre-Charging

Use of this feature prevents surge currents, due to
charging the AC coupling capacitor in the AM 502, from
damaging the circuit under test. Before connecting the
AM 502 to a signal containing a DC component, push the
AC and GND buttons. Connect the input to the circuit
under test. Wait about one second for the coupling
capacitor to charge. Release the GND pushbutton and the
coupling capacitor is charged to the value of the DC voltage
to be measured

1-2

®

Operating Instructions— AM 502

Functions Available at Rear Connector

Signal out, and provisions for signal in connections, are
available at the rear interface connector. See Fig. 1-2 for
assignments. Signal in connections are not factory wired. If
signal in connections are made, use coaxial cable. Connect
one end to the pads as shown on the illustration, and the
other end to the front panel BNC connector. The BNC
connector need not be disconnected from the circuit.

The AM 502 has a slot between connectors 23 and 24.
This identifies it as a member of the signal source family. A
barrier in the corresponding position of the Power Module
connector allows only signal source plug-ins to be used in
that compartment. This protects the plug-in, should special-
ized connections be made to that compartment. Consult
the Building A System section of the Power Module manual
for further information.

ASSIGNMENTS
FUNCTION CONTACT

Pad For + Signal In Ground 25B
Pad for + Signal In 24B

Pad for — Signal In Ground 22B

-H

Pad For — Signal In

21B

-H

-H

l-«-

I-

ASSIGNMENTS
CONTACT FUNCTION

28A Signal Out

27A Signal Out Ground

-r^-i

Fig. 1-2. Input-Output assignments for plug-in rear interface contacts.

MEASUREMENT TECHNIQUES

Single-Ended vs. Differential Measurements

Single-ended measurements often yield unsatisfactory
results because of interference resulting from ground-loop
currents between the AM 502 and the device under test. In
other cases, it may be desirable to eliminate a DC voltage
by means other than the use of a blocking capacitor, which
could limit the low-frequency response. The limitations of
single-ended measurements are effectively eliminated by
using differential measurements. Fig 1-3 shows several
useful examples of differential measurements.

Make differential measurements by connecting each
input (+ input and — input) to selected points in the circuit
under test. Since the chassis of the AM 502 need not be
connected to the test circuit for differential measurements,
there are few limitations to the selection of these test
points. Do not exceed the maximum safe input voltages as
shown in the specification section of this manual. Set the
input coupling switches to the same position, AC or DC,
depending on the measurements being made. In differential
measurements, only the voltage difference between the two
signals is amplified. Common mode signals (common in
amplitude, frequency, and phase) are rejected.

®

1-3

Operating Instructions— AM 502

Double exposure photographs of
the waveforms applied to the
(+) and (— ) input connectors.

Photographs of the resultant
display.

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- ■ +■- 4 — i

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2-A
Two signals of different phase.

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3-B

A composite waveform of a desired signal (square wave) with an interfering line-frequency component is applied
to the (+) input. The interfering signal (sine wave) is also applied to the (— ) input connector.

NOTE: The waveform of the signals applied to the (— ) input connectors will appear inverted when viewed
alone.

Fig. 1-3. Three examples of differential applications.

Common Mode Rejection Ratio

The ability of the AM 502 to reject common-mode
signals is indicated by the common-mode rejection ratio
(CMRR). For example, assume that a signal consists of
unwanted 60 Hz at 10 volts peak to peak (common mode
connected to both inputs), plus a desired signal at 1 mV
peak to peak (differentially connected to one input). The
AM 502 gain is set at 200. The output of the AM 502
shows the desired signal at an amplitude of 0,2 V

(1 mV X 200), and the 60 Hz signal is viewed at an amplitude
of 0.02 V. The CMRR in this application is 100,000:1. This
figure is calculated by multiplying the value of the
common-mode signal (10 V) by the gain of the amplifier
(200) for a product of 2000 V. This product is divided by
the observed 60 Hz voltage at the output (0.02 V) and the
result is the CMRR, 100,000:1. It would, of course, be
impossible to view the 1 mV signal superimposed on the
60 Hz signal by using single input methods,

1-4

<A'

Operating Instructions— AM 502

Degradation of CM RR

There are a number of factors which degrade common-
mode rejection. The principal requirement for maximum

A, 9.90 volts

Amplifier

equal 10.0-volt
generators

B-A = 0.5 volt

10 V
Apparent CMR R = -rr- = 200:1
Ajo v

(A)

A, 9.9990 volts

equal 10-volt
generators

IB)

B-A = .0005 volt

Apparent CM RR =

10 V
.0005 V

20,000:1

Fig. 1-4. Relationship of test point source impedance to the
amplifier input impedance and the apparent CMRR caused by
(A) large difference between test-point impedances and (B) low
impedance test points.

rejection is for the common-mode signal to arrive at the
input FET gates at the same phase and amplitude. A
difference of only 0.01% in the attenuation ratios of the
input attenuators will reduce the rejection ratio to 10,000
to 1 . Also, any difference in source impedance will degrade
the rejection ratio. Figs. 1-4 and 1-5 show CMRR degrada-
tion due to differences in source impedance. The frequency
of the common mode signal also affects the CMRR.
Generally, as the frequency of the input signal increases,
the CMRR is more difficult to maintain.

The high frequency CMRR will also depend upon the
signal source impedance, since various shunt capacitances
between the source and the input gate must charge and
discharge through that impedance.

Outside influences such as magnetic fields can also
degrade the performance, particularly when low level
signals are involved. Magnetic interference may be reduced
by using identical signal transporting leads to the two
inputs. Twist the two leads together over as much of their
length as possible. Low-frequency measurements can be
similarly protected by using a shielded cable that contains a
twisted pair of conductors.

— 1

9 meg
Probe A

C

(Apparent)
Probe- Tolerance CMRR

A

+1%

50:1

B

-1%

50:1

A

+2%

25:1

B

-2%

25:1

A

+3%

16:1

B

-3%

16:1

9 meg
ProbeB | |

Fig, 1-5. Simplified input circuit and table showing the change in
apparent CMRR due to 10X probes that are within 1, 2, and 3% of
their attenuation values (with matched 1 Mfi resistors).

®

1-5

Operating Instructions— AM 502

SPECIFICATIONS

Performance Conditions

The electrical characteristics are valid only if the
AM 502 is calibrated at an ambient temperature between
+20°C and +30°C and operated between 0°C and +50°C,
unless otherwise noted.

ELECTRICAL CHARACTERISTICS

GAIN:

Normal Mode: 100 to 100,000 in a 1-2-5 sequence.

-H 100 Mode: 1 to 1000 in a 1-2-5 sequence.

Accuracy: All modes within 2%.

FREQUENCY RESPONSE:

Direct Coupled: With the GAIN control set to 20K
(DC to 1 MHz) (20,000) or less, the selectable HF
-3 dB points are within 25% of the
indicated setting.

With the GAIN control set to 50K
(50,000), the maximum HF -3 dB
point is at least 500 kHz.
With the GAIN control set to 100K
(100,000), the maximum HF -3 dB
point is at least 250 kHz.

AC Coupled : LF -3 dB is 2 Hz, or less.

OUTPUT (Maximum rated):

Voltage Swing:

Current:

R :

Minimum Load
Impedance:

INPUT RC:

±5 V.
± 20 mA.
5 SI or less.

250 SI.

1 MSI ±0.1% paralleled by *47 pF.

BANDWIDTH (Selectable):

HF -3 dB points: Selectable in 9 steps (1 - 3
sequence) from 100 Hz to 1 MHz
(also limited by FREQUENCY
RESPONSE at GAIN settings of
50Kand 100K.

LF -3 dB points:

COMMON MODE:
Normal Mode:
Range:

Rejection Ratio:

Selectable in 6 steps (1-10
sequence) from 0.1 Hz to 10 kHz
when dc coupled. Each step within
25% of the indicated setting.

+ 5 V.

100 dB DC to 50 kHz, direct cou-

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COMMON MODE (cont):

-M00 Mode

Range: ±50 V.

Rejection Ratio: 50 dB DC to 50 kHz direct cou-
pled with < 100 V p-p sine wave
input.

DC OFFSET RANGE: >± 1 V.
MAXIMUM SAFE INPUT VOLTAGE:

Direct Coupled:
Normal Mode:

+ 100 Mode:

AC Coupled:

MAXIMUM INPUT
GATE CURRENT
(each input):

NOISE (Tangentially
Measured referred
to input):

15 V (DC + Peak AC) to 5 MHz.

350 V (DC + Peak AC).

350 V (DC + Peak AC) with cou-
pling capacitor precharged.

50 pA at 25°C.

25juV or less with 25SI or less
source resistance, from 5 Hz to
1 MHz.

VOLTAGE DRIFT with
TEMPERATURE 100 juV per °C.

(referred to input):

VOLTAGE DRIFTwith
TIME (Referred to in-
put):

<10 juV (p-p) per minute
<20^V (p-p) per hour.

POWER
TION:

CONSUMP-

6 Watts

ENVIRONMENTAL:

Temperature:

Operating:

Storage;

O Cto+50 C
—40° C to J -75°C

1-6

REV. 8, SFPT. 1975

Section 2-AM 502

THEORY
OF OPERATION

Introduction

Refer to the schematic diagrams and the block diagram,
all located in the pullout pages at the back of this manual,
for a complete understanding of the AM 502 circuit
operation.

Input Coupling

In the DC mode, signals pass directly from the + and —
input connectors to the H- 100 switch, which switches the-^
100 attenuators in or out of the circuit. In the AC mode,
C10 and C20 are connected in series with the + and -
inputs, respectively, as DC blocking capacitors. When C10 is
being precharged, it is connected to ground through R10
(the same case exists for C20 and R20), and the input at
the attenuator is grounded. R35, R38, C32, C34, C35, and
C38 comprise the AC compensated ± 100 attenuator for
the + input. C35 sets the input capacity in the attenuated
mode. C30 sets the input capacitance in the normal mode.
The — input attenuator and — input capacitance adjust-
ments are identical with the + input. R40 adjusts for
optimum DC CMRR when the AM 502 is operating in the-^
100 mode.

age, a temperature-sensitive current balancing network is
included, using thermistors (RT104— RT203) as the sensing
elements.

Preamp

The preamp circuit in the AM 502 is made up of two
identical feedback amplifiers connected in a differential
configuration. The overall gain of the preamp is approx-
imately 42 to the output of Q1 52A and B.

The supply voltages for the preamp are obtained from a
common power supply, which is bootstrapped to the input
to improve common-mode rejection. The positive current
source, Q410A and B, and Q416 and its associated
circuitry, are one end of a divider string that provides the
correct operating potentials for the stages in the preamp.
The current sink at the bottom of the divider string is
Q443. See Fig. 2-1. The current branches through parallel
paths at the top of the string, and is summed back into the
string via Q445. The difference in current magnitudes at the
top and bottom of the string is absorbed by Q451 .

Input Overdrive Protection

F100, F200 and diode clamps CR108, CR109, CR208,
and CR209 provide overdrive protection for Q121A and B
at the ± 15 V level. The ± 15 V level is set by zeners
VR438 and VR448 through isolation diodes CR438 and
CR448. If the signal amplitude exceeds approximately
16.5 V, depending on duration of the excess voltage, the
fuses will open.

Gate Current Compensation

Leakage current, associated with the gates of the Input
FETs, through the input resistors, R100 and R200,
develops an offset voltage at the input gates. At high gain
settings, this offset drives the output into overrange. This
leakage can be as high as 100 pA (at 25° C), although
usually it is much less. (100 pA through 1 M£2 to ground
will produce a DC offset of 100 juV.) To compensate for
this leakage current, the FET gates are returned to an
adjustable, slightly negative voltage source through R106,
R107, R206, R207, and variable R105and R205.

Q422 A and B, Q426, and associated circuitry make up
the negative current source for the input FETs. Since the
current sources are very high impedances, both the negative
and positive supplies 'float' with the common-mode signal
swing of ±5 volts. The common-mode signal is introduced
into the supplies via Q451 in the positive supply, and via the
common sources of the input FETs in the negative supply.

DC Offset

Q141 A and B, Q145 A and B, and DC OFFSET
COARSE and FINE controls, R467 and R468 provide
means to offset any differential DC component of the input
signal. This allows observation of AC components while
maintaining good differential capability.

R461, Coarse Step Gain DC Bal adjustment (on the
switching diagram) provides current balance in the two
sides of the amplifier on all positions of the LF -3 dB
switch, except DC OFFSET.

Leakage current, associated with the input FET gates
and the overdrive protection diodes, increases quite rapidly
with temperature increase, approximately doubling every
10°C. To compensate for this temperature-dependent leak-

Input Cross Neutralization

Stray capacitive coupling exists between components of
the + and — input amplifiers of the preamp. If a signal is
applied to the + input, capacitive coupling produces

®

2-1

Theory of Operation— AM 502

+Current Source

^ ToQ121AandB
Collectors

ToQ131AandB
Emitters

Common-mode

4 Signal from Q121

A and B Sources

ToQ131AandB
Collectors

ToQ141Aand B
Q145A and B

—Current Source

Fig, 2-1 + and — Current sources and divider.

22

®

Theory of Operation— AM 502

undesirable currents in the — amplifier input. If there is any
impedance between the — input and ground, the capacitive
current produces a voltage across that impedance. This
voltage across the — input impedance subtracts from the +
input signal, producing an erroneous output.

C222 (connected in the — input amplifier) is adjusted to
divert the undersirable capacitive current away from the
input line, minimizing the unbalance. C122 performs the
same function for signals applied to the + input.

High Frequency Common-Mode Balance

At higher frequencies, stray capacitances to ground at
various points in the preamp begin to inject a significant
differential current (as a result of common-mode signals)
into the amplifier, producing a signal at the amplifier
output. C150, connected from a common-mode signal
point (the floating power supply) is adjusted to minimize
this output current to extend the range of frequencies over
which useful common-mode rejection can be obtained.

Preamp Output Stage

The final stage (Q152 A and B) of the preamp
contributes a small amount of gain. Its primary function is
to reduce the common-mode DC level to zero volts.

CR150 and CR250 rectify the input signal to drive the
overrange detector circuitry. The diodes are normally
conducting very slightly. When the input signal exceeds
about 5 volts common-mode, the diodes turn on hard and
drive the emitter of Q251 in the overrange detector circuit
to light the OVERRANGE indicator.

STEP GAIN DC BAL, R158, provides a balance which
prevents output DC level shift when the GAIN switch is
rotated through its gain setting positions.

LF -3 dB POINT Selector

This switch selects the low frequency —3 dB point of the
amplifier by switching series RC networks between the
output of Q152 and the input of Q162. The selector has a
range of 0.1 Hz through 10 kHz in decade steps.

open-loop gain in the differential mode, while offering very
low common-mode gain.

R161, Step Gain AC Bal, balances the bias voltages of
Q164 A and Q164 B.

Q167 and Q267 serve two functions. The base-emitter
junctions of these transistors serve as reverse-bias protection
for Q168 and Q268. When the stage gain is excessive, the
output signal at Q167-Q267 drives the overrange indicator
circuitry to indicate a differential overrange condition.

HF -3 dB POINT Selector

This switch selects the high frequency point by
switching shunt capacitance across the output of the gain
switching stage. The selector has a range of 100 Hz through
1 MHz in multiples of 1 and 3.

Variable Gain Stage

This stage is a feedback amplifier having a gain of
approximately ten in the calibrated variable position
(switch S178 closed) and a gain of approximately four with
R1 78 set at maximum resistance (S1 78 open).

R269 corrects for current imbalance introduced by the
previous stage (bias balancing Q164 A and B). With Q171A
and Q171B source voltages identical, rotating the front-
panel VARIABLE control causes no shift of the DC output
level.

CR181 and CR281 act as peak detectors, providing a
signal to the overrange detector circuit (Q501 emitter). A
swing greater than +6 volts on the collectors of Q181 or
Q281 will give an overrange indication.

The common-mode level is detected at the junction of
R175-R275, and is compared to ground by the comparator
Q195-Q196. The comparator output is fed back to Q171A
and B via Q269 to maintain the R178-R278 junction at
zero volts.

The single-ended output of the variable gain stage is fed
to the unity gain trans-impedance output amplifier.

Gain Switching Amplifier

The Gain Switching Amplifier is a differential feedback
amplifier having a gain range of 0.48 to 480. The gain is
changed by switching values of resistance between Q162 A
and B sources. This amplifier comfiguration has high

Output Amplifier

The output amplifier provides a ±5-volt differential
swing with a 0-volt DC level. The output R is approx-
imately 2 £2. The output amplifier is short circuit protected
to ground and to the power supply. If the current in R571

®

2-3

Theory of Operation— AM 502

causes the voltage at Q571B collector to fall far enough
below the level of Q555 emitter, CR555 conducts, taking
current from Q555 (the current source for Q561A),
reducing the drive to Q571B, thus limiting the output
current.

Overrange Indicator

When any of the three input transistors, Q501 , Q51 1 , or
0.521, is turned on by an overrange signal from the
amplifier, a turn-on current is supplied to Q532 base.

amplifiers control the current to the unit through series-
pass transistors located in the power module. The inputs of
both integrated circuits seek common levels by varying the
current supplied to the unit. Should the power supply load
increase, pin 2 of U990, (in the —15 V supply) goes more
positive, causing pin 6 to go more negative. This action
increases current flow in the series-pass transistor and
restores the voltage to the initial level. The +15V supply
operates in the same manner, except that the polarities are
different.

Q532 and Q541 comprise a monostable multivibrator
which has a minimum on time of approximately 200 ms;
thus, the indicator lamp is held on for a minimum of
200 ms, regardless of the duration of the overrange signal.

Should the current increase to a level that the voltage
drop across R970 is great enough to cause Q990 to
conduct, current is taken from the series-pass transistor
until it is turned off. This action limits the current available
to the amplifier, should an overload or short circuit occur.

Power Supplies

Regulation of the ± 15 V is accomplished through
operational amplifiers in the AM 502. These operational

The minus supply is referenced to the +15 V; the
positive supply is referenced through VR910 to +9 V.

2-4

®

Service Information— AM 502

DIAGRAMS, PARTS LISTS, AND ILLUSTRATIONS

Symbols and Reference Designators

Electrical components shown on the diagrams are in the following units unless noted otherwise:

Capacitors = Values one or greater are in picofarads (pF).
Values less than one are in microfarads (txF).
Resistors = Ohms (SI)

Symbols used on the diagrams are based on ANSI Y32.2 — 1970.

Logic symbology is based on MIL-STD-806B in terms of positive logic. Logic symbols depict the logic function performed
and may differ from the manufacturer's data.

The following special symbols are used on the diagrams:

3

<Z>

External Screwdriver adjustment.

External control or connector.

Clockwise control rotation in direction of arrow.

Refer to diagram number indicated in diamond.

Refer to waveform number indicated in hexagon.

Connection soldered to circuit board.

Connection made to circuit board with interconnecting pin.

Blue tint encloses components located on circuit board.

R/Q circuit board!

®

3-1

AM 502

REPLACEABLE
ELECTRICAL PARTS

PARTS ORDERING INFORMATION

Replacement parts are available from orthrough your local Tektronix, Inc. Field Office
or representative.

Changes to Tektronix instruments are sometimes made to accommodate improved
components as they become available, and to give you the benefit of the latest circuit
improvements developed in our engineering department. It is therefore important, when
ordering parts, to include the following information in your order: Part number, instrument
type or number, serial number, and modification number if applicable.

If a part you have ordered has been replaced with a new or improved part, your local
Tektronix, Inc. Field Officeor representative will contact you concerning any change in part
number.

Change information, if any, is located at the rear of this manual.

SPECIAL NOTES AND SYMBOLS

X000 Part first added at this serial number
O0X Part removed after this serial number

ITEM NAME

In the Parts List, an Item Name is separated from the description by a colon (:).
Because of space limitations, an Item Name may sometimes appear as incomplete. For
further Item Name identification, the U.S. Federal Cataloging Handbook H6-1 can be
utilized where possible.

ABBREVIATIONS

ACTR

ACTUATOR

PLSTC

PLASTIC

ASSY

ASSEMBLY

QTZ

QUARTZ

CAP

CAPACITOR

RECP

RECEPTACLE

CER

CERAMIC

RES

RESISTOR

CKT

CIRCUIT

RF

RADIO FREQUENCY

COMP

COMPOSITION

SEL

SELECTED

CONN

CONNECTOR

SEMICOND

SEMICONDUCTOR

ELCTLT

ELECTROLYTIC

SENS

SENSITIVE

ELEC

ELECTRICAL

VAR

VARIABLE

INCAND

INCANDESCENT

WW

WIREWOUND

LED

LIGHT EMITTING DIODE

XFMR

TRANSFORMER

NONWIR

NON WIREWOUND

XTAL

CRYSTAL

®

3-2

Electrical Parts List— AM 502

CROSS INDEX MFR. CODE NUMBER TO MANUFACTURER

MFR.CODE

MANUFACTURER

ADDRESS

CITY,STATE,ZIP

00853 SANGAMO ELECTRIC CO., S. CAROLINA DIV.
01002 GENERAL ELECTRIC CO., INDUSTRIAL AND

POWER CAPACITOR PRODUCTS DEPT.
01121 ALLEN-BRADLEY CO.
01295 TEXAS INSTRUMENTS, INC.,

SEMICONDUCTOR GROUP
02735 RCA CORP., SOLID STATE DIVISION
03508 GENERAL ELECTRIC CO . , SEMI-CONDUCTOR

PRODUCTS DEPT.
04713 MOTOROLA, INC., SEMICONDUCTOR

PRODUCTS DIV.
07263 FAIRCHILD SEMICONDUCTOR, A DIV. OF

FAIRCHILD CAMERA AND INSTRUMENT CORP.
07910 TELEDYNE SEMICONDUCTOR
11237 CTS KEENE, INC.
12040 NATIONAL SEMICONDUCTOR CORP.
17537 LAMPS, INC., DIV. OF MARCO-OAK INC.

DELETED, REPLACED BY: 87034
21845 SOLITRON DEVICES, INC., TRANSISTOR DIV.
24931 SPECIALTY CONNECTOR CO., INC.
50157 N. L. INDUSTRIES, INC., ELECTRONICS

DEPT.
56289 SPRAGUE ELECTRIC CO.
71400 BUSSMAN MFG . , DIVISION OF MCGRAW-

EDISON CO.
71590 CENTRALAB ELECTRONICS, DIV. OF

GLOBE -UNION, INC.
72982 ERIE TECHNOLOGICAL PRODUCTS, INC.
73138 BECKMAN INSTRUMENTS, INC., HELIPOT DIV.
74970 JOHNSON, E. F., CO.
75042 TRW ELECTRONIC COMPONENTS, IRC FIXED

RESISTORS, PHILADELPHIA DIVISION
78488 STACKPOLE CARBON CO.
80009 TEKTRONIX, INC.
80294 BOURNS, INC., INSTRUMENT DIV.
81483 INTERNATIONAL RECTIFIER CORP.
90201 MALLORY CAPACITOR CO., DIV. OF

P. R. MALLORY CO., INC.
91637 DALE ELECTRONICS, INC.
91836 KINGS ELECTRONICS CO., INC.

P. O. BOX 128

JOHN ST.

1201 2ND ST. SOUTH

P. 0. BOX 5012
ROUTE 202

ELECTRONICS PARK

5005 E. MCDOWELL RD.

464 ELLIS ST.
12515 CHADRON AVE.

COMMERCE DRIVE

1177 B1UE HERON B1VD.
3560 MADISON AVE.

P. 0. BOX 787

2536 W. UNIVERSITY ST.

5757 N. GREEN BAY AVE.
644 W. 12TH ST.
2500 HARBOR B1VD.
299 10TH AVE. S. W.

401 N. BROAD ST.

P. 0. BOX. 500
6135 MAGNOLIA AVE.
9220 SUNSET B1VD.

3029 E. WASHINGTON ST.
P. 0. BOX 609

40 MARBLEDALE ROAD

PICKENS, SC 29671

HUDSON FALLS, NY 12839
MILWAUKEE, WI 53204

DALLAS, TX 75222
SOMERVILLE, NY 08876

SYRACUSE, NY 13201

PHOENIX, AZ 85036

MOUNTAIN VIEW, CA 94042
HAWTHORNE, CA 90250
PASO ROBLES, CA 93446
DANBURY, CT 06810

RIVIERA BEACH, FL 33404
INDIANAPOLIS, IN 46227

MUSKEGON, MI 49443
NORTH ADAMS, MA 01247

ST. LOUIS, MO 63107

MILWAUKEE, WI 53201
ERIE, PA 16512
FULLERTON, CA 92634
WASECA, MN 56093

PHILADELPHIA, PA 19108
ST. MARYS, PA 15857
BEAVERTON, OR 97077
RIVERSIDE, CA 92506
LOS ANGELES, CA 90069

INDIANAPOLIS, IN 46206
COLUMBUS, NB 68601
TUCKAHOE, NY 10707

3-3

REV

B FEB. 19 7=

Electrical Parts List— AM 502

Ckt No.

Tektronix
Part No.

Serial/Model No.
Eff Dscont

Name & Description

Mfr
Code Mfr Part Number

Al

CIO
C20
C28

C30
C32

C34
C35
C38
C48
C50

C52
C54
C55
C58
C107

C122
C122
C131
C146
C150

C164
C176
C195
C207
C222

C222
C231
C264
C276
C431

C433
C435
C438
C443
C448

C450
C470
C471
C472
C473

C490
C491
C493
C494
C495

C496
C497
C498
C499
C530

C536

670-2733-00

295-0155-00

281-0663-00
281-0081-00
281-0081-00

281-0645-00
281-0081-00
283-0626-00
381-0663-00
281-0081-00

281-0081-00
281-0645-00
281-0081-00
283-0626-00
283-0005-00

281-0093-00 B010100
281-0092-00 B040000
281-0612-00
283-0177-00
281-0114-00

281-0523-00
281-0618-00
281-0518-00
283-0005-00
281-0093-00

281-0092-00
281-0612-00
281-0523-00
281-0618-00
290-0527-00

290-0527-00
290-0527-00
283-0177-00
290-0527-00
283-0177-00

281-0613-00
283-0594-00
283-0594-00
285-0809-00
285-0809-00

281-0511-00
281-0721-00
283-0604-00
283-0594-00
285-0627-00

285-0598-00
285-0702-00
285-0703-00
285-0633-00
283-0111-00

290-0534-00

B039999

B010100 B039999

B040000

CKT BOARD ASSY:MAIN

CAP., MATCHED: TWO 0.1UF,10%,600V

CAP.,FXD,CER DI:10.4PF,1%,500V
CAP.,VAR,AIR DI:1.8-13PF,375VDC
CAP . ,VAR,AIR DI:1.8-13PF,375VDC

CAP.,FXD,CER DI:8.2PF,+/-0.25PF,500V
CAP.,VAR,AIR DI:1.8-13PF,375VDC
CAP., FXD, MICA D:1800PF,5%,500V
CAP.,FXD,CER DI:10.4PF,1%,500V
CAP.,VAR,AIR DI:1.8-13PF,375VDC

CAP.,VAR,AIR DI:1.8-13PF,375VDC
CAP.,FXD,CER DI:8.2PF,+/-0.25PF,500V
CAP.,VAR,AIR DI:1.8-13PF,375VDC
CAP., FXD, MICA D:1800PF,5%,500V
CAP.,FXD,CER DI:0.01OF, +100-0%, 250V

CAP.,VAR,CER DI:5.5-18PF
CAP.,VAR,CER DI:9-35PF
CAP.,FXD,CER DI:5.6PF,+/-0.5PF,500V
CAP.,FXD,CER DI:1UF, +80-20%, 25V
CAP.,VAR,AIR DI:1. 3-5. 4PF, 750V

CAP.,FXD,CER DI:100PF,+/-20PF,350V
CAP.,FXD,CER DI:4.7PF,+/-0.5PF,200V
CAP.,FXD,CER DI:47PF,+/-9.4PF,500V
CAP.,FXD,CER DI:0.01UF, +100-0%, 250V
CAP.,VAR,CER DI:5.5-18PF

CAP.,VAR,CER DI:9-35PF
CAP.,FXD,CER DI:5.6PF,+/-0.5PF,500V
CAP . ,FXD ,CER DI : 100PF ,+/-20PF , 350V
CAP.,FXD,CER DI:4.7PF,+/-0.5PF,200V
CAP . ,FXD ,ELCTLT : 15UF , 20% , 20V

CAP . ,FXD,ELCTLT :15UF , 20% , 20V
CAP. ,FXD,ELCTLT:15UF,20%,20V
CAP.,FXD,CER DI:1UF, +80-20%, 25V
CAP . ,FXD ,ELCTLT : 15UF , 20% , 20V
CAP.,FXD,CER DI:1UF, +80-20% ,25V

CAP.,FXD,CER DI:10PF,+/-1PF,200V
CAP. , FXD, MICA D:0.001UF,1%,100V
CAP., FXD, MICA D:0.001UF,1%,100V
CAP.,FXD,PLSTC:1UF,10%,50V
CAP . ,FXD,PLSTC :1UF,10% ,50V

CAP.,FXD,CER DI:22PF,+/-2.2PF,500V
CAP.,FXD,CER DI:72PF,5%,500V
CAP., FXD, MICA D:304PF,2%,300V
CAP., FXD, MICA D:0.001UF,1%,100V
CAP.,FXD,PLSTC:0.0033UF,5%,100V

CAP.,FXD,PLSTC:0.01UF,5%,100V
CAP. ,FXD,PLSTC:0.033UF,5%,100V
CAP. ,FXD,PLSTC:0.1UF,5%,100V
CAP.,FXD,PLSTC:0.22UF,20%,200V
CAP.,FXD,CER DI:0.1UF,20%,50V

CAP . ,FXD,ELCTLT :1UF ,20% , 35V

80009 670-2733-00

80009

295-0155-00

72982

374-005C0G01049F

74970

189-6-5

74970

189-6-5

72982

374-O11C0H0829C

74970

189-6-5

00853

D195E182J0

72982

374005COG1049F

74970

189-6-5

74970

189-6-5

72982

374-011COH0829C

74970

189-6-5

00853

D195E182J0

72982

8131-250651103P

72982

538-011C0P092R

72982

538-011E2P094R

72982

374-001C0H0569D

72982

8131N039651105Z

74970

189-0352-075

72982

3O1-0O0U2M0101M

72982

374-001C0HO479D

72982

301-000D2J0470M

72982

8131-250651103P

72982

538-011C0P092R

72982

538-011E2P094R

72982

374-001C0H0569D

72982

301-0OOU2M0101M

72982

374-001C0H0479D

90201

TDC156M020NLF

90201

TDC156M020NLF

90201

TDC156M020NLF

72982

8131N039651105Z

90201

TDC156M020NLF

72982

8131N039651105Z

72982

374-001COG0100F

00853

D151F102F0

00853

D151F102F0

56289

LP66A1A105K

56289

LP66A1A105K

72982

301-OOOC0GO220K

72982

301-OOOP3K720J

00853

D153F3040G0

00853

D151F102F0

56289

410P33251

01002

61F10AC103

56289

410P111

56289

410P112

56289

410P22491

72982

8131N075651104M

56289 196D105X0035HA1

REV. C JAN. 1975

3-4

Electrical Parts List— AM 502

Tektronix

Serial/Model No.

Ckt No.

Part No.

Eff Dscont

C552

281-0511-00

C560

283-0111-00

C570

283-0111-00

C910

290-0512-00

C922

283-0111-00

C924

283-0111-00

C926

283-0111-00

C930

290-0527-00

C942

283-0111-00

C960

290-0527-00

C964

283-0111-00

C966

283-0111-00

C968

283-0111-00

CR108

152-0323-00

CR109

152-0323-00

CR131

152-0141-02

CR150

152-0141-02

CR181

152-0141-02

CR208

152-0323-00

CR209

152-0323-00

CR231

152-0141-02

CR250

152-0141-02

CR281

152-0141-02

CR438

152-0141-02

CR441

152-0141-02

CR448

152-0141-02

CR531

152-0141-02

CR555

152-0141-02

CR558

152-0141-02

CR560

152-0141-02

CR561

152-0141-02

CR570

152-0141-02

CR571

152-0141-02

DS50

150-0107-00

DS900

150-0107-00

FlOO

159-0024-00

F200

159-0024-00

J10

131-0955-00

J15

129-0103-00

J20

131-0955-00

J550

131-0818-00

L164

108-0409-00

L264

108-0409-00

L416

276-0507-00

L426

276-0507-00

L445

276-0507-00

Q121A,B

151-1027-00

Q131A,B

151-0261-00

Q136

151-1025-00

Q141A.B

151-0176-00

Q145A,B

151-0261-00

Name & Description

Mfr
Code Mfr Part Number

CAP.,FXD,CER DI:22PF,+/-2.2PF,500V
CAP.,FXD,CER DI:0.1UF,20%,50V
CAP.,FXD,CER DI:0.1UF,20%,50V
CAP.,FXD,ELCTLT:22UF,20%,15V
CAP.,FXD,CER DI:0.1UF,20%,50V

CAP.,FXD,CER DI:0.1UF,20%,50V
CAP.,FXD,CER DI:0.1UF,20%,50V
CAP. ,FXD,ELCTLT:15UF,20%,20V
CAP.,FXD,CER DI:0.1UF,20%,50V
CAP.,FXD,ELCTLT:15UF,20%,20V

CAP.,FXD,CER DI:0.1UF,20%,50V
CAP.,FXD,CER DI:0.1UF,20%,50V
CAP.,FXD,CER DI:0.1UF,20%,50V

SEMICOND DEVICE:
SEMICOND DEVICE:
SEMICOND DEVICE;
SEMICOND DEVICE;
SEMICOND DEVICE;

SILICON, 35V, 100MA
SILICON, 35V, 100MA
SILICON, 30V, 150MA
SILICON, 30V, 150MA
SILICON, 30V, 150MA

SEMICOND DEVICE:SILICON,35V,100MA
SEMICOND DEVICE:SILICON,35V,100MA
SEMICOND DEVICE:SILICON,30V,150MA
SEMICOND DEVICE:SILICON,30V,150MA
SEMICOND DEVICE:SILICON,30V,150MA

SEMICOND DEVICE :SILIC0N, 30V, 150MA
SEMICOND DEVICE:SILICON,30V,150MA
SEMICOND DEVICE:SILICON,30V,150MA
SEMICOND DEVICE:SILICON,30V,150MA
SEMICOND DEVICE:SILICON,30V,150MA

SEMICOND DEVICE:
SEMICOND DEVICE:
SEMICOND DEVICE;
SEMICOND DEVICE;
SEMICOND DEVICE:

SILICON, 30V, 150MA
SILICON, 30V, 150MA
SILICON, 30V, 150MA
SILICON, 30V, 150MA
SILICON,30V,150MA

LAMP, INCAND: 12V, 0.04A,T-1
LAMP , INCAND : 12V , . 04A , T-l

FUSE, CARTRIDGE :3AG,0.06A, 250V, FAST BLOW
FUSE , CARTRIDGE : 3AG , . 06A , 250V , FAST BLOW

CONNECTOR, RCPT, :BNC, FEMALE
POST , BDG , ELEC : ASSEMBLY
CONNECTOR, RCPT, :BNC, FEMALE
CONNECTOR , RCPT , : BNC , FEMALE

COIL,RF:17.5UH
COIL,RF:17.5UH
SHIELDING BEAD,:0.6UH
SHIELDING BEAD , : . 6UH
SHIELDING BEAD,:0.6UH

TRANSISTOR: SILICON, JFE,N-CHAN
TRANS I STOR : SILICON , PNP , DUAL
TRANSISTORrSILICON, JFE ,N-CHANNEL
TRANSISTOR : SILICON , NPN , DUAL

TRAMS ISTOR : SIL ICON , PNP , DUAL

72982 301-0OOC0G0220K

72982 8131N075651104M

72982 8131N075651104M

56289 196D226X0015KA1

72982 8131N075651104M

72982 8131N075651104M

72982 8131N075651104M

90201 TDC156M020NLF

72982 8131N075651104M

90201 TDC156M020NLF

72982 8131N075651104M

72982 8131N075651104M

72982 8131N075651104M

03508 SE365

03508 SE365

07910 1N4152

07910 1N4152

07910 1N4152

03508 SE365

03508 SE365

07910 1N4152

07910 1N4152

07910 1N4152

07910 1N4152

07910 1N4152

07910 1N4152

07910 1N4152

07910 1N4152

07910 1N4152

07910 1N4152

07910 1N4152

07910 1N4152

07910 1N4152

17537

227

17537

227

71400

AGC1-16

71400

AGC1-16

24931

28JR200-1

80009

129-0103-00

24931

28JR200-1

91836

KC19-153BNC

80009 108-0409-00

80009 108-0409-00

78488 57-0180-7D

78488 57-0180-7D

78488 57-0180-7D

80009 151-1027-00

12040 NS7410

01295 SBA8129

04713 SD555

12040 NS7410

3-5

REV. C FEB. 1975

Electrical Parts List— AM 502

Ckt No.

Tektronix
Part No.

Serial/Model No.
Eff Dscont

Nome & Description

Mfr
Code

Mfr Part Number

Q152A,B 153-0586-00

Q162A,B 151-1036-00

Q164A,B 153-0586-00

Q167 151-0190-00

Q168 151-0220-00

Q171A,B

Q181

Q185

Q195

Q196

Q236
Q267
Q268

Q269
Q281

Q285

Q410A,B

0416

Q422A,B

0426

0431
Q443
0445
0451
Q501

Q511
Q521
Q532
Q540
Q541

Q555

Q558

Q561A,B

Q571A,B

0.910

Q910
Q940
Q942
Q990
Q990

RIO
R20
R30
R35
R38

R40
R50

R55
R58
R103

R105
R106
R107

151-1029-00
151-0188-00
151-0190-00
151-0220-00
151-0220-00

151-1025-00
151-0190-00
151-0220-00
151-0220-00
151-0188-00

151-0190-00
153-0586-00
151-0220-00
153-0587-00
151-0190-00

151-0190-00
151-0190-00
151-0220-00
151-0220-00
151-0220-00

151-0220-00
151-0220-00
151-0190-00
151-0260-00
151-0220-00

151-0220-00
151-0190-00
151-0307-00
151-0309-00
151-0301-00

151-0302-00
151-0334-00
151-0190-00
151-0302-00
151-0301-00

315-0105-00
315-0105-00
322-0687-07
322-0624-07
321-0289-03

311-1566-00
322-0687-07
322-0624-07
321-0289-03
321-0281-00

311-1559-00
315-0107-00
315-0107-00

B010100 B040389

B040390

B010100
B040390

B040289

TRANSISTOR: SILICON, PNP .PAIR
TRANSISTOR : SILICON, JFE ,N-CHANNEL ,DUAL
TRANSISTOR: SILICON, PNP ,PAIR
TRANSISTOR : SILICON ,NPN
TRANSISTOR:SILICON,PNP

TRANS ISTOR : SILICON , JFE , N-CHANNEL , DUAL
TRANSISTOR : SILICON , PNP
TRANSISTOR: SILICON , NPN
TRANS ISTOR : S ILICON , PNP
TRANSISTOR : SILICON , PNP

TRANSISTOR:SILIC0N, JFE, N-CHANNEL
TRANSISTOR:SILICON ,NPN
TRANSISTOR:SILICON,PNP
TRANSISTOR:SILICON,PNP
TRANSISTOR: SILICON , PNP

TRANSISTOR:SILICON,NPN
TRANSISTOR: SILICON, PNP , PAIR
TRANSISTOR : SILICON , PNP
TRANSISTOR: SILICON, NPN , PAIR
TRANSISTOR : S ILICON , NPN

TRANSISTOR:
TRANSISTOR:
TRANSISTOR:
TRANSISTOR:
TRANSISTOR:

TRANSISTOR:
TRANSISTOR;
TRANSISTOR:
TRANSISTOR:
TRANSISTOR:

SILICON, NPN
SILICON, NPN
SILICON, PNP
SILICON, PNP
SILICON, PNP

SILICON, PNP
; SILICON, PNP
SILICON, NPN
SILICON r NPN
; SILICON, PNP

TRANS ISTOR : SIL ICON , PNP
TRANSISTOR:SILICON,NPN
TRANSISTOR : SILICON , PNP , DUAL
TRANSISTOR : SILICON , NPN ,DUAL
TRANSISTOR: SILICON,PNP

TRANSISTOR
TRANSISTOR
TRANSISTOR
TRANSISTOR
TRANSISTOR

SILICON,NPN
SILICON,NPN
SILICON, NPN
SILICON, NPN
SILICON, PNP

RES.,FXD,CMPSN:1M OHM,5%,0.25W
RES.,FXD,CMPSN:1M OHM,5%,0.25W
RES., FXD, FILM: 100. 5M OHM,0.1%,0.25W
RES.,FXD,FILM:990K OHM,0.1%,0.25W
RES., FXD, FILM :10K OHM,0.25%,0.125W

RES.,VAR,NONWIR:200 OHM,20%,0.50W
RES.,FXD,FILM:100.5M OHM,0.1%,0.25W
RES., FXD, FILM: 990K OHM,0.1%,0.25W
RES.,FXD,FILM:10K OHM,0.25%,0.125W
RES.,FXD,FILM:8.25K OHM,1%,0.125W

RES.,VAR,NOMWIR:10K OHM,20%,0.50W
RES.,FXD,CMPSN:100M OHM,5%,0.25W
RES.,FXD,CMPSN:100M OHM,5%,0.25W

80009
21845
80009
80009
80009

153-0586-00

FD1551

153-0586-00

151-0190-00

151-0220-00

01295 SFB8823

04713 2N3906

80009 151-0190-00

80009 151-0220-00

80009 151-0220-00

01295 SBA8129

80009 151-0190-00

80009 151-0220-00

80009 151-0220-00

04713 2N3906

80009 151-0190-00

80009 153-0586-00

80009 151-0220-00

80009 153-0587-00

80009 151-0190-00

80009 151-0190-00

80009 151-0190-00

80009 151-0220-00

80009 151-0220-00

80009 151-0220-00

80009 151-0220-00

80009 151-0220-00

80009 151-0190-00

02735 2N5189

80009 151-0220-00

80009 151-0220-00

80009 151-0190-00

07263 SP13404

07263 SP13378

04713 2N2907A

04713 2N2222A

80009 151-0334-00

80009 151-0190-00

04713 2N2222A

04713 2N2907A

01121 CB1055

01121 CB1055

91637 MFF1421C10053B

75042 CEBT0-9903B

75042 CEAT2-1002C

73138 91A-200R0M

91637 MFF1421C10053B

75042 CEBT0-9903B

75042 CEAT2-1002C

75042 CEAT0-8251F

73138 91A-10001M

01121 CB1075

01121 CB1075

REV. C FEB. 1975

3-6

Electrical Parts List— AM 502

Tektronix Serial/Model No.

Ckt No.

Part No. Eff Dscont

R120

315-0101-00

R121

321-0222-00

R122

315-0512-00

R125

321-0114-00

R126

321-0927-07

R131

321-0251-00

R136

321-0199-06

R137

315-0101-00

R141

321-0813-07

R145

321-0353-00

R146

321-0272-00

R152

321-0222-00

R154

321-0225-06

R155

321-0154-00 B010100 B039999

R155

321-0150-00 B040000

R157

315-0564-00

R158

311-0467-00

R159

311-1567-00 B010100 B039999

R159

311-1566-00 B040000

R160

315-0102-00

R161

311-1564-00

R162

321-0240-00

R164

321-0309-00

R166

321-0143-00

R168

321-0224-00

R170

315-0102-00

R171

321-0277-00

R173

321-0239-07

R175

321-0289-07

R176

321-1267-03

R177

321-0147-00

R178 1

311-1494-00

R181

321-0187-00

R184

321-0297-00

R185

321-0236-00

R191

311-1555-00

R193

315-0474-00

R195

315-0512-00

R196

315-0682-00

R198

315-0472-00

R205

311-1559-00

R206

315-0107-00

R207

315-0107-00

R220

315-0101-00

R221

321-0222-00

R222

315-0512-00

R225

321-0114-00

R226

321-0927-07

R231

321-0251-00

R236

321-0199-06

R237

315-0101-00

R241

321-0813-07

R245

321-0353-00

Name & Description

Mfr
Code Mfr Part Number

RES. ,FXD,CMPSN:100 OHM,5%,0.25W
RES.,FXD,FILM:2K OHM,1%,0.125W
RES.,FXD,CMPSN:5.lK OHM,5%,0.25W
RES.,FXD,FILM:150 OHM,1%,0.125W
RES.,FXD,FILM:125 OHM,0.1%,0.125W

RES.,FXD,FILM:4.02K OHM,1%,0.125W
RES., FXD, FILM :1.15K OHM,0.25%,0.125W
RES.,FXD,CMPSN:100 OHM,5%,0.25W
RES.,FXD,FILM:495 OHM,0.1%,0.125W
RES.,FXD,FILM:46.4K OHM , 1% , . 125W

RES.,FXD,FILM:6.65K OHM,1%,0.125W
RES.,FXD,FILM:2K OHM,1%,0.125W
RES.,FXD,FILM:2.15K OHM, 0.25%, 0.125
RES.,FXD,FILM:392 OHM,1%,0.125W
RES., FXD, FILM: 357 OHM,1%,0 .125W

RES.,FXD,CMPSN:560K OHM,5%,0.25W
RES.,VAR,NONWIR:100K OHM, 20%, 0. SOW
RES.,VAR,NONWIR:100 OHM,20%,0.50W
RES.,VAR,NONWIR:200 OHM,20%,0.50W
RES.,FXD,CMPSN:1K OHM,5%,0.25W

RES.,VAR,NONWIR:500 OHM,20%,0.50W
RES.,FXD,FILM:3.09K OHM,1%,0.125W
RES., FXD, FILM: 16. 2K OHM,1%,0.125W
RES., FXD, FILM: 301 OHM,1%,0.125W
RES.,FXD,FILM:2.1K OHM,1%,0.125W

RES.,FXD,CMPSN:1K OHM,5%,0.25W
RES.,FXD,FILM:7.5K OHM,1%,0.125W
RES., FXD, FILM: 3. OIK OHM,0.1%,0.125W
RES., FXD, FILM :10K OHM.,0 .1%,0.125W
RES.,FXD,FILM:5.97K OHM, 0.25% ,0.125W

RES. ,FXD, FILM: 332 OHM,1%,0.125W
RES. ,VAR,NONWIR:2K OHM,10%,1W
RES.,FXD,FILM:866 OHM,1%,0.125W
RES., FXD, FILM: 12. IK OHM,l% ,0 . 125W
RES., FXD, FILM: 2. 8K OHM,l% ,0.125W

RES. ,VAR,NONWIR:100K OHM,20%,0.5W
RES. ,FXD,CMPSN:470K OHM,5%,0.25W
RES. ,FXD,CMPSN:5.1K OHM,5%,0.25W
RES.,FXD,CMPSN:6.8K OHM,5%,0.25W
RES.,FXD,CMPSN:4.7K OHM,5%,0.25W

RES.,VAR,NONWIR:10K OHM,20%,0.50W
RES. ,FXD,CMPSN:100M OHM,5%,0.25W
RES.,FXD,CMPSN:100M OHM,5%,0.25W
RES.,FXD,CMPSN:100 OHM,5%,0.25W
RES.,FXD,FILM:2K OHM,1%,0.125W

RES.,FXD,CMPSN:5.1K OHM,5%,0.25W
RES., FXD, FILM: 150 OHM,1%,0. 125W
RES., FXD, FILM: 125 OHM,0.1%,0.125W
RES.,FXD,FILM:4.02K OHM,1%,0.125W
RES.,FXD,FILM:1.15K OHM,0.25%,0 .125W

RES.,FXD,CMPSN:100 OHM,5%,0.25W
RES.,FXD,FILM:495 OHM, 0.1% ,0.125W
RES.,FXD,FILM:46.4K OHM,1%,0 .125W

01121 CB1015

75042 CEAT0-2001F

01121 CB5125

75042 CEATO-1500F

91637 MFF1816C125R0B

75042 CEAT0-4021F

75042 CEAT9-1151C

01121 CB1015

75042 CEAT9-4950B

75042 CEAT0-4642F

75042 CEAT0-6651F

75042 CEAT0-2001F

75042 CEAT9-2151C

75042 CEAT0-3920F

75042 CEATO-3570F

01121 CB5645

11237 41334

73138 91A-100R0M

73138 91A-200R0M

01121 CB1025

73138 91A-500R0M

75042 CEAT0-3091F

75042 CEAT0-1622F

75042 CEAT0-3010F

75042 CEAT0-2101F

01121 CB1025

75042 CEAT0-7501F

75042 CEAT9-3011B

75042 CEAT9-1002B

75042 CEAT2-5971C

75042 CEAT0-3320F

01121 11M187

75042 CEAT0-8660F

75042 CEAT0-1212F

75042 CEAT0-28O1F

73138 91A-10002M

01121 CB4745

01121 CB5125

01121 CB6825

01121 CB4725

73138 91A-10001M

01121 CB1075

01121 CB1075

01121 CB1015

75042 CEAT0-2001F

01121 CB5125

75042 CEAT0-1500F

91637 MFF1816C125R0B

75042 CEAT0-4021F

75042 CEAT9-1151C

01121 CB1015

75042 CEAT9-4950B

75042 CEAT0-4642F

Furnished as a unit with S178.

3-7

REV. C FEB. 1975

Electrical Parts List— AM 502

Tektronix

Serial/Model No.

Ckt No

Part No.

Eff Dscont

R246

321-0272-00

R252

321-0222-00

R254

321-0225-06

R255

321-0154-00

B010100 B039999

R255

321-0150-00

B040000

R260

315-0102-00

R261

321-0239-00

R262

321-0240-00

R264

321-0309-00

R266

321-0143-00

R268

321-0224-00

R269

311-1564-00

R270

315-0102-00

R271

321-0277-00

R273

321-0239-07

R276

321-1267-03

R277

321-0147-00

R284

321-0314-00

R285

321-0236-00

R410

321-0068-00

R411

321-0068-00

R414

315-0680-00

R420

322-0238-00

R421

321-0274-00

R422

315-0470-00

R423

321-0068-00

R424

321-0068-00

R431

321-0182-00

R433

321-0179-00

R435

321-0233-00

R436

315-0472-00

R438

315-0222-00

R440

321-0268-00

R441

321-0247-00

R442

321-0400-00

R443

315-0471-00

R44S

321-0218-00

R446

315-0472-00

R448

315-0222-00

R450

315-0222-00

R451

315-0101-00

R460

321-0229-00

R461

311-1566-00

R462

321-0229-00

R464

321-0204-00

R466

315-0105-00

R467

311-1057-00

R468

311-0887-00

R470

316-0155-00

R471

316-0155-00

R474

321-0408-00

R475

321-0408-00

R478

321-0303-00

Name & Description

Mfr
Code

Mfr Part Number

RES.,FXD,FILM:6.65K OHM,1%,0.125W
RES., FXD, FILM :2K OHM,1%,0.125W
RES.,FXD,FILM:2.15K OHM, 0.25%, 0.125
RES. , FXD, FILM: 392 OHM,1%,0.125W
RES., FXD, FILM: 357 OHM,1%,0.125W

RES.,FXD,CMPSN:1K OHM,5%,0.25W
RES.,FXD,FILM:3.01K OHM,1%,0.125W
RES., FXD, FILM: 3. 09K OHM,1%,0.125W
RES. ,FXD,FILM:16.2K OHM,1%,0.125W
RES., FXD, FILM: 301 OHM,1%,0.125W

RES., FXD, FILM: 2. IK OHM,l% ,0.125W
RES. ,VAR,NONWIR:500 OHM,20%,0.50W
RES.,FXD,CMPSN:1K OHM,5%,0.25W
RES. , FXD, FILM: 7. 5K OHM,1%,0.125W
RES.,FXD,FILM:3.01K OHM,0.1%,0.125W

RES., FXD, FILM: 5. 97K OHM,0.25%,0.125W
RES., FXD, FILM: 332 OHM,1%,0.125W
RES.,FXD,FILM:18.2K OHM,1%,0.125W
RES., FXD, FILM: 2. 8K OHM,1%,0.125W
RES.,FXD,FILM:49.9 OHM,l% ,0.125W

RES.,FXD,FILM:49.9 OHM,l% ,0.125W
RES.,FXD,CMPSN:68 OHM,5%,0.25W
RES.,FXD,FILM:2.94K OHM,1%,0.25W
RES.,FXD,FILM:6.98K OHM,1%,0.125W
RES.,FXD,CMPSN:47 OHM,5%,0.25W

RES.,FXD,FILM:49.9 OHM,1%,0.125W
RES.,FXD,FILM:49.9 OHM,1%,0.125W
RES.,FXD,FILM:768 OHM,1%,0 .125W
RES.,FXD,FILM:715 OHM,1%,0.125W
RES.,FXD,FILM:2.61K OHM,1%,0. 125W

RES.,FXD,CMPSN:4.7K OHM,5%,0.25W
RES.,FXD,CMPSN:2.2K OHM,5%,0.25W
RES.,FXD,FILM:6.04K OHM,1%,0.125W
RES., FXD, FILM: 3. 65K OHM,1%,0 .125W
RES., FXD, FILM :143K OHM,1%,0.125W

RES.,FXD,CMPSN:470 OHM,5%,0.25W
RES.,FXD,FILM:1.82K OHM,1%,0.125W
RES.,FXD,CMPSN:4.7K OHM,5%,0.25W
RES.,FXD,CMPSN:2.2K OHM,5%,0.25W
RES.,FXD,CMPSN:2.2K OHM,5%,0.25W

RES.,FXD,CMPSN:100 OHM,5%,0.25W
RES., FXD, FILM: 2. 37K OHM,1%,0 .125W
RES.,VAR,NONWIR:200 OHM,20%,0.50W
RES.,FXD,FILM:2.37K OHM,1%,0.125W
RES.,FXD,FILM:1.3K OHM,1%,0.125W

RES.,FXD,CMPSN:1M OHM,5%,0.25W
RES.,VAR,N0NWIR:5K OHM, 3%, 1%, LIN, 10 TURN
RES.,VAR,NONWIR:50K OHM, 10% ,0.50W
RES.,FXD,CMPSN:1.5M OHM,10%,0.25W
RES.,FXD,CMPSN:1.5M OHM,10%,0.25W

RES., FXD, FILM :174K OHM,1%,0.125W
RES., FXD, FILM :174K OHM,1%,0.125W
RES.,FXD,FILM:14K OHM,1%,0.125W

75042 CEAT0-6651F

75042 CEAT0-2001F

75042 CEAT9-2151C

75042 CEAT0-392OF

75042 CEAT0-3570F

01121

CB1025

75042

CEAT0-3011F

75042

CEAT0-3091F

75042

CEAT0-1622F

75042

CEAT0-3010F

75042

CEAT0-2101F

73138

91A-500R0M

01121

CB1025

75042

CEAT0-7501F

75042

CEAT9-3011B

75042

CEAT2-5971C

75042

CEATO-3320F

75042

CEAT0-1822F

75042

CEAT0-2801F

75042

CEAT0-49R9OF

75042

CEATO-49R90F

01121

CB6805

75042

CEBT0-2941F

75042

CEAT0-6981F

01121

CB4705

75042 CEATO-49R90F

75042 CEAT0-49R90F

75042 CEATO-7680F

75042 CEAT0-7150F

75042 CEAT0-2611F

01121 CB4725

01121 CB2225

75042 CEAT0-6041F

75042 CEAT0-3651F

75042 CEAT0-1433F

01121 CB4715

75042 CEAT0-1821F

01121 CB4725

01121 CB2225

01121 CB2225

01121 CB1015

75042 CEAT0-2371F

73138 91A-200R0M

75042 CEAT0-2371F

75042 CEATO-1301F

01121 CB1055

80294 3540S-420-502

80009 311-0887-00

01121 CB1551

01121 CB1551

75042 CEAT0-1743F

75042 CEAT0-1743F

75042 CEAT0-1402F

REV. C FEB. 1975

3-8

Electrical Parts List— AM 502

Tektronix

Serial/Model No.

Ckt No.

Part No.

Eff Dscont

R479

321-0303-00

R480

321-0289-03

R481

321-0816-07

R482

321-0222-03

R483

321-0193-03

R484

321-0612-03

R485

321-0126-03

R486

321-0097-03

R487

321-0751-06

R488

321-0030-02

R489

321-0001-01

R501

316-0225-00

R503

321-0452-00

R504

321-0423-00

R507

315-0473-00

R510

315-0104-00

R511

315-0104-00

R513

315-0104-00

R521

316-0276-00

R523

321-0423-00

R524

321-0452-00

R531

315-0224-00

R532

315-0103-00

R533

315-0103-00

R536

315-0104-00

R541

315-0681-00

R542

315-0103-00

R550

315-0682-00

R551

315-0153-00

R552

315-0102-00

R553

315-0682-00

R555

315-0302-00

R558

315-0302-00

R559

315-0202-00

R560

315-0101-00

R561

315-0181-00

R562

307-0104-00

R570

315-0101-00

R571

315-0181-00

R572

307-0104-00

R900

304-0102-00

B010100 B02999S

R900

303-0511-00

B030000

R910

315-0821-00

R915

321-0285-00

R916

321-0268-00

R920

307-0105-00

R922

315-0100-00

R924

315-0100-00

R926

315-0100-00

R940

307-0106-00

R942

315-0102-00

R945

315-0912-00

R946

315-0622-00

Name & Description

Mfr
Code

Mfr Part Number

RES., FXD, FILM :14K OHM,1%,0.125W
RES. ,FXD, FILM :10K OHM,0.25%,0.125W
RES.,FXD,FILM:5K OHM,0.1%,0.125W
RES., FXD, FILM: 2K OHM,0.25%,0.125W
RES., FXD, FILM: IK OHM,0.25%,0. 125W

RES.,FXD,FILM:500 OHM, 0.25% ,0.125W
RES., FXD, FILM: 200 OHM, 0.25%, 0.125%
RES.,FXD,FILM:100 OHM, 0. 25%, .125%
RES.,FXD,FILM:50 OHM, 0.25% ,0.125W
RES., FXD, FILM: 20 OHM,0 .5% ,0. 125W

RES., FXD, FILM: 10 OHM,0.5%,0.125W
RES.,FXD,CMPSN:2.2M OHM,10%,0.25W
RES.,FXD,FILM:499K OHM,1%,0 .125W
RES.,FXD,FILM:249K OHM,l% ,0.125W
RES.,FXD,CMPSN:47K OHM,5%,0.25W

RES.,FXD,CMPSN:100K OHM,5%,0.25W
RES.,FXD,CMPSN:100K OHM,5%,0.25W
RES.,FXD,CMPSN:100K OHM,5%,0.25W
RES.,FXD,CMPSN:27M OHM,10%,0.25W
RES., FXD, FILM :249K OHM,l% ,0.125W

RES.,FXD,FILM:499K OHM,l% ,0.125W
RES.,FXD,CMPSN:220K OHM,5%,0.25W
RES.,FXD,CMPSN:10K OHM,5%,0.25W
RES.,FXD,CMPSN:10K OHM,5%,0.25W
RES.,FXD,CMPSN:100K OHM,5%,0.25W

RES.,FXD,CMPSN:680 OHM,5%,0.25W
RES.,FXD,CMPSN:10K OHM,5%,0.25W
RES.,FXD,CMPSN:6.8K OHM,5%,0.25W
RES.,FXD,CMPSN:15K OHM,5%,0.25W
RES.,FXD,CMPSN:1K OHM,5%,0.25W

RES.,FXD,CMPSN:6.8K OHM,5%,0.25W
RES.,FXD,CMPSN:3K OHM,5%,0.25W
RES.,FXD,CMPSN:3K OHM,5%,0.2SW
RES.,FXD,CMPSN:2K OHM,5%,0.25W
RES.,FXD,CMPSN:100 OHM,5%,0.25W

RES.,FXD,CMPSN:180 OHM,5%,0.25W
RES. ,FXD,CMPSN:3.3 OHM,5%,0.25W
RES.,FXD,CMPSN:100 OHM,5%,0.25W
RES.,FXD,CMPSN:180 OHM,5%,0.25W
RES.,FXD,CMPSN:3.3 OHM,5%,0.25W

RES.,FXD,CMPSN:1K OHM,10%,1W
RES.,FXD,CMPSN:510 OHM,5%,lW
RES.,FXD,CMPSN:820 OHM,5%,0.25W
RES., FXD, FILM: 9. 09K OHM,1%,0.125W
RES.,FXD,FILM:6.04K OHM,1%,0.125W

RES. ,FXD,CMPSN:3.9 OHM,5%,0.25W
RES.,FXD,CMPSN:10 OHM,5%,0.25W
RES.,FXD,CMPSN:10 OHM,5%,0.25W
RES.,FXD,CMPSN:10 OHM,5%,0.25W
RES.,FXD,CMPSN:4.7 OHM,5%,0.25W

RES.,FXD,CMPSN:1K OHM,5%,0.25W
RES.,FXD,CMPSN:9.1K OHM,5%,0.25W
RES.,FXD,CMPSN:6.2K OHM,5%,0.25W

75042

75042
75042
75042
75042

CEAT0-1402F

CEAT2-1002C

CEAT9-5001B

CEAT22KC

CEAT2-1001C

75042 CEAT2-50OOC

75042 CEAT2-200R0C

91637 MFF1816G1OOR0C

75042 CEAT9-50R00C

75042 CEAT2-20R00D

75042 CEATO-10ROOD

01121 CB2251

75042 CEAT0-4993F

75042 CEAT0-2493F

01121 CB4735

01121 CB1045

01121 CB1045

01121 CB1045

01121 CB2761

75042 CEAT0-2493F

75042 CEAT0-4993F

01121 CB2245

01121 CB1035

01121 CB1035

01121 CB1045

01121 CB6815

01121 CB1035

01121 CB6825

01121 CB1535

01121 CB1025

01121 CB6825

01121 CB3025

01121 CB3025

01121 CB2025

01121 CB1015

01121 CB1815

01121 CB33G5

01121 CB1015

01121 CB1815

01121 CB33G5

01121 GB1021

01121 GB5115

01121 CB8215

75042 CEAT0-9091F

75042 CEATO-6041F

01121 CB39G5

01121 CB1005

01121 CB1005

01121 CB1005

01121 CB47G5

01121 CB1025

01121 CB9125

01121 CB6225

3-9

REV. C FEB. 1975

ADJUSTMENTS

Services Available

Tektronix Inc. provides complete instrument repair and
adjustment at local Field Service Centers and at the Factory
Service Center. Contact your local Tektronix Field Office
or representative for further information.

Test Equipment

For calibration of the AM 502, the following equipment
is required:

Oscilloscope with vertical deflection factor of
100 mV/Div to 10 V/Div and bandwidth of at least 2 MHz,
Tektronix 5100 or 5400 series or equivalent.

Square-wave generator with 1 kHz output frequency,
output amplitude variable from +1 V to +5 V, Tektronix
type FG 501 or equivalent.

Preparation

The AM 502 can be operated either fully installed in a
TM 500 Series Power Module, or connected to the Power
Module via a flexible plug-in extender (Tektronix part
number 067-0645-01 ). Remove the Power Module cabinet
to make adjustments when the AM 502 is calibrated inside
the Power Module. All adjustments are located on the left
side of the board. Make adjustments at an ambient
temperature between +20°C and +30°C.

1 . Adjust Step Gain AC Balance

Set the LF -3 dB to the 10 Hz position and the HF -3 dB
to the .1 KHz position. Make certain that the 4- 100
pushbutton is out. Connect the test oscilloscope vertical
input, DC coupled at 1.0 V/Div., to the AM 502 output.
Push both GND pushbuttons. While rotating the GAIN
switch from stop to stop, adjust R161, Step Gain AC Bal,
for no output DC level change. Return the GAIN switch to
the 100 position.

5. Adjust + Input Gate Leakage Current Compensation

Connect the 5012 termination to the + Input of the
AM 502 and set the GAIN to the 1 K position. Make
certain that both AC pushbuttons are depressed. Set the
test oscilloscope for a deflection sensitivity of 100 mV/Div
and position the trace to the graticule center. Adjust R105,
+ Input Gate Leakage Current Comp, for minimum trace
shift while alternately depressing and releasing the + GND
pushbutton.

6. Adjust — Input Gate Leakage Current Compensation

Move the termination to the — input and make certain
that the + input GND pushbutton is depressed. Both AC
pushbuttons must be depressed. Leave the other controls as
in the previous step. Adjust R205, — Input Gate Leakage
Current Comp, for minimum trace shift while alternately
depressing and releasing the — GND pushbutton. Release
both AC pushbuttons.

7. Adjust Input Cross Neutralization

Set the GAIN to the 100 position and the HF -3 dB to
1 MHz. The LF -3 dB switch must be in the DC position.
Connect the function generator (set for square-wave out-
put, centered around ground, 1 ms period) through the 10X
attenuator and 50 £2 termination to the + input of the
AM 502. Release the + input GND pushbutton and make
certain that the - input GND pushbutton is in and the AC
pushbutton is out. Set the test oscilloscope for a vertical
deflection factor of 1 V/Div, and a horizontal deflection
factor of .2 ms/Div. Adjust the amplitude of the square-
wave generator for a test oscilloscope display of four
divisions. While pushing and releasing the — input GND
pushbutton, adjust C222, + Input Cross Neutralization, for
a similar-looking upper front corner on the square wave in
both positions of the GND pushbutton. Change the input
connection to the — input, release the — input GND
button, and repeat the procedure using the + input GND
pushbutton and adjusting C222, - Input Cross Neutraliza-
tion adjustment.

8. Adjust I

Using th
add the 47
and the —
pushbutton
released. Ii
maintain fc
Adjust C5I
looking up[
normalizer
and press
procedure,
best lookini

9. Adjust/

Remove
vertical def
pushbutton
amplitude 1

Constant amplitude sine-wave generator, output ampli-
tude at least 15 V P-P and frequency of 50 kHz, Tektronix
type FG 501 or equivalent.

Standard amplitude calibrator with 5 mV output,
Tektronix Calibration Fixture 067-0502-01 or equivalent.

Termination, 50 £2, BNC connectors, Tektronix part
number 011-0049-01 or equivalent.

Attenuator, 10X, BNC connectors, Tektronix part num-
ber 01 1-0059-01 or equivalent.

Dual Input Connector, BNC connectors, Tektronix part
number 067-0525-00 or equivalent.

Input Normalizer, 47 pF, Tektronix part number
067-0541-00.

Coaxial Cable, 50 12, BNC connector, Tektronix part
number 012-0057-01 or equivalent.

2. Adjust Variable Gain DC Balance

Using the same control settings as in the previous step,
adjust R269, Var Gain DC Bal, for no output DC level
change while rotating the CAL knob from stop to stop.
Return the CAL knob to the fully CW detent position.

3. Adjust Output DC Level

Without changing the AM 502 control positions from
those in the previous step, obtain a ground reference on the
test oscilloscope in the 7,0 V/Div vertical deflection posi-
tion. Adjust R191, Output DC Level, to the previously
established zero reference level.

4. Adjust Coarse Step Gain DC Balance

Set the LF -3 dB to the DC position, the GAIN at 10 k,
and the STEP GAIN DC BAL to midrange. Set the test
oscilloscope vertical deflection factor at 1 V/Div and obtain
a ground reference. Leave the other controls as in the
previous step. Adjust R461, Coarse Step Gain DC Bal, for
zero volts (within one volt) on the test oscilloscope.

®l

REV. JUNE 1974

ADJUSTMENTS

AM 502

either fully installed in a
connected to the Power
xtender (Tektronix part
le Power Module cabinet
VI 502 is calibrated inside
ts are located on the left
stments at an ambient
30°C.

Josition and the HF -3 dB
certain that the + 100
test oscilloscope vertical
. to the AM 502 output.
While rotating the GAIN
R161, Step Gain AC Bal,
3turn the GAIN switch to

ce

is as in the previous step,
for no output DC level
knob from stop to stop.
CW detent position.

I control positions from
a ground reference on the
i vertical deflection posi-
Level, to the previously

lance

sition, the GAIN at 10 k,
3 midrange. Set the test
tor at 1 V/Div and obtain
)ther controls as in the
;e Step Gain DC Bal, for
test oscilloscope.

5. Adjust + Input Gate Leakage Current Compensation

Connect the 50 £2 termination to the + Input of the
AM 502 and set the GAIN to the 1 K position. Make
certain that both AC pushbuttons are depressed. Set the
test oscilloscope for a deflection sensitivity of 100 m V/Div
and position the trace to the graticule center. Adjust R105,
+ Input Gate Leakage Current Comp, for minimum trace
shift while alternately depressing and releasing the + GND
pushbutton.

6. Adjust — Input Gate Leakage Current Compensation

Move the termination to the — input and make certain
that the + input GND pushbutton is depressed. Both AC
pushbuttons must be depressed. Leave the other controls as
in the previous step. Adjust R205, — Input Gate Leakage
Current Comp, for minimum trace shift while alternately
depressing and releasing the — GND pushbutton. Release
both AC pushbuttons.

7. Adjust Input Cross Neutralization

Set the GAIN to the 100 position and the HF -3 dB to
1 MHz. The LF -3 dB switch must be in the DC position.
Connect the function generator (set for square-wave out-
put, centered around ground, 1 ms period) through the 10X
attenuator and 50 £2 termination to the + input of the
AM 502. Release the + input GND pushbutton and make
certain that the — input GND pushbutton is in and the AC
pushbutton is out. Set the test oscilloscope for a vertical
deflection factor of 1 V/Div, and a horizontal deflection
factor of .2 ms/Div. Adjust the amplitude of the square-
wave generator for a test oscilloscope display of four
divisions. While pushing and releasing the — input GND
pushbutton, adjust C222, + Input Cross Neutralization, for
a similar-looking upper front corner on the square wave in
both positions of the GND pushbutton. Change the input
connection to the — input, release the — input GND
button, and repeat the procedure using the + input GND
pushbutton and adjusting C222, — Input Cross Neutraliza-
tion adjustment.

8. Adjust Input Capacitance

Using the same setup as described in the previous step,
add the 47 pF Normalizer between the 50 Q, termination
and the - input on the AM 502. Push the + input GND
pushbutton. Make certain the — input GND pushbutton is
released. Increase the square-wave generator output to
maintain four divisions of display on the test oscilloscope.
Adjust C50, - Input Comp (Normal), for the flattest
looking upper front corner on the square wave. Change the
normalizer to the + input, release + input GND pushbutton,
and press the — input GND pushbutton. Repeat the
procedure, adjusting C30, + Input Comp (Normal), for the
best looking upper front corner.

9. Adjust Attenuator Compensation

Remove the 10X attenuator. Set the test oscilloscope
vertical deflection factor to .1 V/Div. Depress the -^100
pushbutton, and adjust the square-wave generator output
amplitude for a four division display. Make certain the —

ooyyye

IMPEDANCE

INPUT
CONNECTOR

input GND pushbutton is in. Alternately adjust C35, +
Attn Input Cap, and C32, + Attn Comp, for the best
looking upper front corner and flattest top on the square
wave display. Change the normalizer to the — input, release
the — input GND and push the + input GND pushbutton.
Repeat the procedure adjusting C55, — Attn Input Cap and
C52, — Attn Comp for the best looking upper front corner
and flattest top on the square wave. Remove the signal
from the — input.

10, Adjust Attenuator Common Mode Rejection Ratio

Make certain the -M00 pushbutton is in, and the AC and
GND pushbuttons for both channels are out. Set the GAIN
switch at 10 K. Remove the 50 Q, termination and normal-
izer. Apply a 10 V P-P 1 kHz square wave through the dual
input cable to both inputs of the AM 502. Connect the test
oscilloscope, set for 2 V/Div vertical deflection, to the
output of the AM 502. Adjust R140 Attn DC CMRR, for
minimum display amplitude. Remove the square wave from
the input of the AM 502 and connect a 50 kHz 10 V P-P
sine wave to both input connectors through the dual input
cable. Check that the C34, + Attn Comp, and C52, - Attn
Comp, are set for minimum display amplitude. Remove the
sine wave from the input.

1 1 . Adjust Amplifier Gain

Set the GAIN switch to the 1 K position. Release the-r
100 pushbutton. Connect the Standard Amplitude Cali-
brator set for an output of 5 mV to the AM 502 + input
connector. Make certain the + input AC and GND
pushbuttons are out. Push the — input GND pushbutton.
Check that the HF -3 dB is in the 1 MHz position and the
LF -3 dB switch is in the 0.1 Hz position. Connect the test
oscilloscope to the OUTPUT connector, and set the vertical
deflection factor at 1 V/Div. Adjust R159, Gain Cal, for
exactly five divisions of vertical deflection on the test
oscilloscope.

12. Adjust High Frequency CMRR

Connect the sine wave generator through a coaxial cable
to the dual input connector. Set the frequency at 50 KHz
and the amplitude at 10 V P-P. Connect the dual input
connector to both inputs of the AM 502. Release both AC
and GND pushbuttons. Set the gain switch to 100 and the
LF -3 dB switch to DC. Connect the output of the AM 502
to the test oscilloscope, set for a vertical deflection factor of
20 mV/Div, and a horizontal deflection factor of 20 Ms/Div.
Adjust C150, HF CMRR, for minimum amplitude displayed
on the test oscilloscope.

REV. JUNE 1974

AM 502

PARTS LOCATION GRID

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CR150

C35

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CR181

C38

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CR208

C48

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CR209

C50

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CR231

C54

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CR250

C55

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CR281

C58

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CR438

C107

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13

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C131

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CR531

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16

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C195

C5

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C448

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C470

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C490

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K4

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15

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15

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C2

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F3

R162

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R560

C2

C560

B2

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F3

R164

E3

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J4

R561

A2

C570

B2

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C5

R166

E3

R435

J4

R562

C2

C910

B6

Q281

E2

R168

D4

R436

J3

R570

C2

C922

D5

Q285

D2

R170

F2

R438

J2

R571

B3

C924

H6

Q410

J5

R171

E2

R440

K4

R572

C3

C926

H6

Q416

J4

R173

E2

R441

K4

R900

A4

C930

B5

Q422

J5

R175

D2

R442

K4

R910

D6

C942

D6

Q426

K5

R176

D3

R443

K4

R915

C5

C960

C5

Q431

J4

R177

D2

R445

K3

R916

D6

C964

G6

Q443

L4

R178

E3

R446

J3

R920

C5

C966

G6

Q445

K4

R181

E2

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J2

R922

E5

C968

D5

Q451

J4

R184

C1

R450

J4

R924

H6

REV. B, FEB, 1975

AM 502

470
-3dB

G,AIW SWITCHED
AMPLIFIER

QI6.4

QI4.7

<5lfc8
Q24.7
G*Zk8

<5>

I
_l

>FFSET

QW5

S430
HF -3dB

VARIABLE S,AIN
5TA^E

QI8I
QI8S

Qiq=.

QZ8S

<s>

+ 15 VOLT^
+ 5 VOLTS

-15 VOLTS

OUTPUT
AMPLIFIES.

Q5S5
Q558
Q56.I
QS7I

<S>

->Z8A

J5SO

t=?

OUTPUT
MAX.

->27A

OVER-R-AW^E
DETECTOR

Q50I Q5"J2
GL5II d54l
Q52I Q540

♦

DS1=,0

OVER-R-AN^E

DC SUPPLY

REGULATORS

Cj<ilO Q«R90
QR40 tHIO

(5^42 uqqo

<$>

I1B

^ +%.'5V

ds goo
3) | POWER.

2A

^A

■^ +II.5V

SB

> -Vi.SV

CONTROLS AND CONNECTORS

Variable Gain

Calibrated in the cw
position.

STEP GAIN DC BAL

Adjusts DC balance in
the preamplifier stage.

OVERRAIMGE

Lamp lit indicates most
over range conditions.

AC

Button in AC couples
+ Input, button out DC
coupled.

GND

Button in grounds
+ amplifier input.

+ Input BNC Connector
Ground Binding Post —

— Input BNC Connector

* 100

Button out normal
mode, button divides
GAIN switch setting by
100.

Release Latch

Lift and pull to remove
plug-in.

GND

Button in grounds
■ amplifier input.

DC OFFSET COARSE and
FINE

Provides internal offset
bias up to at least ±1 V.
LF — 3dB switch must be
in the DC OFFSET
position for controls to
operate.

GAiN

Selects amplifier gain.

POWER

Lamp lit indicates
power is applied.

HF -3 dB

Selects
point.

LF-3dB

upper 3 dB

Selects lower 3 dB
point and activates DC
OFFSET controls.

OUTPUT

CD

r
O
n

>
a

>

2

Button in AC couples
— Input, button out DC
coupled.

®

B

LOCK

D|A.CqR.

DtH
AM 057%

®

DIFFERENTIAL
CURRENT SOUK.CE

0.410

Q4I4,

Q422

QAli.

Q43I

&4-4-=,
Q445

<i>

t5

sio

(COUPLING)

ATTENUATOR.

<3>

JI5>

>T,

5BO

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out :
NORM

♦

J20

S20
Ccoupuiwqi

ATTENUATOR.

<i>

PREAMP

QIZI
QIBI

<5I=>2
Q25(e

<i>

S470
LF -3<JB

i

G,AIW SWITCHED
AMPLIFIER.

Q1&2.
GU6.4
QIC7
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Q24.7

<$>

DC OFFSET
QI4I QI45

VARIABLE G)AIN
5TA5E

QI7I

Q18I

Q185

QI<1=>

Ql<H»

GU8I

<3>

OUTPUT
AMPLIFIER.

Q555
Q558
QSfcl
Q57I

<3>

->Z8A

J5SO

t3

OUTPUT
MAX

->27A

D5SO

JE3) OVER.-R-AN^E

+ 15 VOLT^s
+ •5 VOLTS

-15 VOLTS

DC SUPPLY
REGULATORS

Q^tlO Q«?«iO
Q<WO U1IO

Qq42 uqqo

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2A

1A.

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3B

> -V5.-5V

AMS02

®

Block DiA<q£.AM

DtH
057*.

®

(DC PL i)

+ 15V

<3x§> "t

<T>— S470

AM 502

(DC PL j) (DC PL F)

Pre amp <(r>

AM 502

COLL.
QI68

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S490

HF -3dB

/shown IN CCW \
leu kh z pos\tionJ

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I £ f I U _ _ J

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0.1
30
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MHz

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10

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R488
20 |

R487
50

9 l"P 19 i '9 i'P l'9

R486
100 ,

R465
ZOO, 5

R484
500,

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R482

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5K.

5480
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(SHOWN CCW X lOo)

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IOK.

n r n n I I J ^— ""I -_

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Z.00
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IK
ZK
5K
10 K
20 K
50 K.
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R468 I FINE I
50K ' '

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IM

R464
I.30K

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(DC PL))

BASE QI45A
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STEP SAIN
DC BAL

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15

• • • • • •

— • • _ _ • •"_ _"• _"• • _ •

_ • • _ _ •_••_ •__•• L

• • • • "l • • • •

_ • • _ • _ •"_ •"_ •"_ •"_ •

• • • • • •• •

10 1

I KH^

o.l 1

10 1

I Hz

0.1 1

DC

DC OFFSET

CCW

4-

ANA S02

®,

s

D E

WITCH UETAIL^

<3>

REV. FEB 1974

+ 33. 5V ^

+-

"t

+ 15 VOLTS

+ 15 VOLTS
(DCPL I)

+ 15 VOLTS
(DCPL 2)

+ 15 VOLTS
(DCPL 3)

+ 5 VOLTS

-15 VOLTS
(DCPL 3)

-15 VOLTS
(DCPL 2)

-15 VOLTS
(DCPL I)

-15 VOLTS

SEE PARTS LIST FOR EARLIER
VALUES AND SERIAL NUMBER
RANGES OF PARTS MARKED
WITH BLUE OUTLINE.

-33.5V^

AM50Z

REV C, JAN. 1S76

OWER.

Su

PP LY

♦

Bvz

REV. FE.& 1374

AM 502

REPLACEABLE
MECHANICAL PARTS

PARTS ORDERING INFORMATION

Replacement parts are available from or through your local
Tektronix, Inc. Field Office or representative.

Changes to Tektronix instruments are sometimes made to
accommodate improved components as they become available,
and to give you the benefit of the latest circuit improvements
developed in our engineering department. It is therefore
important, when ordering parts, to include the following
information in your order: Part number, instrument type or
number, serial number, and modification number if applicable.

If a part you have ordered has been replaced with a new or
improved part, your local Tektronix, Inc. Field Office or
representative will contact you concerning any change in part
number.

Change information, if any, is located at the rear of this
manual.

SPECIAL NOTES AND SYMBOLS

X000 Part first added at this serial number
00X Part removed after this serial number

FIGURE AND INDEX NUMBERS

Items in this section are referenced by figure and index
numbers to the illustrations.

INDENTATION SYSTEM

This mechanical parts list is indented to indicate item
relationships. Following is an example of the indentation system
used in the description column.

7 2 3 4 5

Name & Description

Assembly and/or Component

Attaching parts for Assembly and/or Component

Detail Part of Assembly and/or Component
Attaching parts for Detail Part

Parts of Detail Part

Attaching parts for Parts of Detail Part

Attaching Parts always appear in the same indentation as
the item it mounts, while the detail parts are indented to the right.
Indented items are part of, and included with, the next higher
indentation. The separation symbol — * — indicates the end of
attaching parts.

Attaching parts must be purchased separately, unless otherwise
specified.

ITEM NAME

In the Parts List, an Item Name is separated from the
description by a colon (:). Because of space limitations, an Item
Name may sometimes appear as incomplete. For further Item
Name identification, the U.S. Federal Cataloging Handbook H6-1
can be utilized where possible.

ABBREVIATIONS

INCH

ELCTRN

ELECTRON

IN

INCH

SE

SINGLE END

#

NUMBER SIZE

ELEC

ELECTRICAL

INCAND

INCANDESCENT

SECT

SECTION

ACTR

ACTUATOR

ELCTLT

ELECTROLYTIC

INSUL

INSULATOR

SEMICOND SEMICONDUCTOR

ADPTR

ADAPTER

ELEM

ELEMENT

INTL

INTERNAL

SHLD

SHIELD

ALIGN

ALIGNMENT

EPL

ELECTRICAL PARTS LIST

LPHLDR

LAMPHOLDER

SHLDR

SHOULDERED

AL

ALUMINUM

EQPT

EQUIPMENT

MACH

MACHINE

SKT

SOCKET

ASSEM

ASSEMBLED

EXT

EXTERNAL

MECH

MECHANICAL

SL

SLIDE

ASSY

ASSEMBLY

FIL

FILLISTER HEAD

MTG

MOUNTING

SLFLKG

SELF-LOCKING

ATTEN

ATTENUATOR

FLEX

FLEXIBLE

NIP

NIPPLE

SLVG

SLEEVING

AWG

AMERICAN WIRE GAGE

FLH

FLAT HEAD

NON WIRE

NOT WIRE WOUND

SPR

SPRING

BD

BOARD

FLTR

FILTER

OBD

ORDER BY DESCRIPTION

SQ

SQUARE

BRKT

BRACKET

FR

FRAME or FRONT

OD

OUTSIDE DIAMETER

SST

STAINLESS STEEL

BRS

BRASS

FSTNR

FASTENER

OVH

OVAL HEAD

STL

STEEL

BRZ

BRONZE

FT

FOOT

PH BRZ

PHOSPHOR BRONZE

sw

SWITCH

BSHG

BUSHING

FXD

FIXED

PL

PLAIN or PLATE

T

TUBE

CAB

CABINET

GSKT

GASKET

PLSTC

PLASTIC

TERM

TERMINAL

CAP

CAPACITOR

HDL

HANDLE

PN

PART NUMBER

THD

THREAD

CER

CERAMIC

HEX

HEXAGON

PNH

PAN HEAD

THK

THICK

CHAS

CHASSIS

HEX HD

HEXAGONAL HEAD

PWR

POWER

TNSN

TENSION

CKT

CIRCUIT

HEX SOC

HEXAGONAL SOCKET

RCPT

RECEPTACLE

TPG

TAPPING

COMP

COMPOSITION

HLCPS

HELICAL COMPRESSION

RES

RESISTOR

TRH

TRUSS HEAD

CONN

CONNECTOR

HLEXT

HELICAL EXTENSION

RGD

RIGID

V

VOLTAGE

COV

COVER

HV

HIGH VOLTAGE

RLF

RELIEF

VAR

VARIABLE

CPLG

COUPLING

IC

INTEGRATED CIRCUIT

RTNR

RETAINER

W/

WITH

CRT

CATHODE RAY TUBE

ID

INSIDE DIAMETER

SCH

SOCKET HEAD

WSHR

WASHER

DEG

DEGREE

IDENT

IDENTIFICATION

SCOPE

OSCILLOSCOPE

XFMR

TRANSFORMER

DWR

DRAWER

IMPLR

IMPELLER

SCR

SCREW

XSTR

TRANSISTOR

REV. D SEPT. 1975

3-11

Mechanical Parts List— AM 502

CROSS INDEX MFR. CODE NUMBER TO MANUFACTURER

MFR.CODE

MANUFACTURER

ADDRESS

CITY,STATE,ZIP

02107 SPARTA MFG. CO.

12327 FREEWAY CORP.

22526 BERG ELECTRONICS, INC.

23499 GAVITT WIRE AND CABLE, DIVISION OF

RSC INDUSTRIES, INC.
24931 SPECIALTY CONNECTOR CO., INC.
45722 USM CORP., PARKER-KALON FASTENER DIV.
70276 ALLEN MFG. CO.
71159 BRISTOL SOCKET SCREW, DIV. OF

AMERICAN CHAIN AND CABLE CO., INC.
71785 TRW ELECTRONIC COMPONENTS, CINCH

CONNECTOR OPERATIONS
73743 FISCHER SPECIAL MFG. CO.
74445 HOLO-KROME CO.
78189 ILLINOIS TOOL WORKS, INC.

SHAKEPROOF DIVISION
78471 TILLEY MFG. CO.
79136 WALDES, KOHINOOR, INC.
79807 WROUGHT WASHER MFG. CO.
80009 TEKTRONIX, INC.
82647 TEXAS INSTRUMENTS , INC . ,

CONTROL PRODUCTS DIV.
83385 CENTRAL SCREW CO.
91836 KINGS ELECTRONICS CO., INC.
97464 INDUSTRIAL RETAINING RING CO.

ROUTE NO. 2, BOX 128
9301 ALLEN DR.
YOUK EXPRESSWAY

455 N. QUINCE ST.
3560 MADISON AVE.
1 PEEKAY DRIVE
P. O. DRAWER 570

40 BRISTOL ST.

1501 MORSE AVE.
446 MORGAN ST.
31 BROOK ST. WEST

ST. CHARLES ROAD
900 INDUSTRIAL RD.
47-16 AUSTEL PLACE
2100 S. BAY ST.
P. 0. BOX 500

34 FOREST ST.
2530 CRESCENT DR.
40 MARBLED ALE ROAD
57 CORDIER ST.

DOVER, OH 44622

CLEVELAND, OH 44125

NEW CUMBERLAND, PA 17070

ESCONDIDO, CA 92025
INDIANAPOLIS, IN 46227
CLIFTON, NJ 07014
HARTFORD, CT 06101

WATERBURY, CT 06720

ELK GROVE VILLAGE, IL 60007
CINCINNATI, OH 45206
HARTFORD, CT 06110

ELGIN, IL 60120

SAN CARLOS, CA 94070

LONG ISLAND CITY, NY 11101

MILWAUKEE, WI 53207

BEAVERTON, OR 97077

ATTLEBORO, MA 02703
BROADVIEW, IL 60153
TUCKAHOE, NY 10707
IRVINGTON, NJ 07111

3-12

REV. C SEPT. 1975

Mechanical Parts List— AM 502

Fig. &

Index Tektronix Serial/Model No.
No. Part No. Eff Dscont

Qty

12 3 4 5

Name & Description

Mfr
Code

Mfr Part Number

1-1

-2

-3

-8

-9

-10

-11

-12

-13

-14

-15
-16

337-
366-
213-
366-
213-
366^
213-
366-
213
366-
213-
366
213
366
213
366
213
366
366
366
426
214'
366
129

■1399-01
•0494-00
■0153-00
■1518-00
•0153-00
•1084-00
■0725-00
-1023-00
-0246-00
-1101-00
-0153-00
-1317-00
-0153-00
-1001-00
-0153-00
-1163-00
-0153-00
-1257-11
-1257-12
-1489-31
-0681-00
-1840-00
-1422-01
-0103-00

B010100 B040799
B010100 B040799
B040800 B049999
B040800 B049999
B050000
B050000

210-0455-00
210-0223-00

2 SHLD,ELECTRICAL:SIDE

1 KNOB: GRAY WITH SETSCREW

1 . SETSCREW:5-40 X 0.125 INCH, HEX SOC STL

1 KNOB: GRAY WITH SETSCREW

1 . SETSCREW:5-40 X 0.125 INCH, HEX SOC STL

1 KNOB: GRAY, WITH SETSCREW

1 . SETSCREW:3-48 X 0.94" , HEX, SOC STL

1 KNOB: GRAY PLASTIC

1 . SETSCREW:5-40 X 0.093 INCH LONG, HEX SOC

1 KNOB: GRAY WITH SETSCREW

1 . SETSCREW:5-40 X 0.125 INCH, HEX SOC STL

1 KNOB: RED WITH SETSCREW

1 . SETSCREW:5-40 X 0.125 INCH, HEX SOC STL

1 KNOB: GRAY WITH SETSCREW

2 . SETSCREW:5-40 X 0.125 INCH, HEX SOC STL
2 KNOB: LIGHT GRAY WITH SETSCREW

1 . SETSCREW: 5-40 X 0.125 INCH, HEX SOC STL

2 PUSH BUTTON: GRAY — AC PRE
2 PUSH BUTTON: GRAY — CHG GND

1 PUSH BUTTON: GRAY—DIVIDE 10

5 FR,PUSH BUTTON: GRAY PLASTIC

1 PIN, KNOB SECRG:

1 KNOB:LATCH 80009 366-1422-01

1 POST,BDG,ELEC:ASSEMBLY

(ATTACHING PARTS)

1 NUT, PLAIN, HEX. :0. 25-28 X 0.375 INCH, BRASS

1 TERMINAL, LUG: 0.2 5 INCH DIA,SE

80009
80009
74445
80009
74445
80009
70276
80009
71159
80009
74445
80009
74445
80009
74445
80009
74445
80009
80009
80009
80009
80009

337-1399-01

366-0494-00

OBD

366-1518-00

OBD

366-1084-00

OBD

366-1023-00

OBD

366-1101-00

OBD

366-1317-00

OBD

366-1001-00

OBD

366-1163-00

OBD

366-1257-11

366-1257-12

366-1489-31

426-0681-00

214-1840-00

80009 129-0103-00

73743 3089-402

78189 2101-14-03-2520N

200-0103-00

1

129-0077-00

1

■17

131-0955-00

2

■18

131-0818-00

1

■19

384-1221-00

B010100 B049999

1

384-0415-01

B050O00

1

•20

1

■21

210-0583-00

1

•22
•?3

210-0940-00

1

1

-24
-25

-26
-27

-28
-29

-32

-33

-34
-35
-36
-37

210-0583-00
210-0940-00

358-0378-00
358-0029-00

210-0590-00
210-0978-00

-30 333-1711-00
-31 214-1513-01

213-0254-00

200-0935-00
378-0602-01
378-0602-00
352-0157-00
386-2529-00

POST ASSEMBLY INCLUDES:
. NUT, PLAIN, KNURL: 0.2 5- 2 8 X 0.375"OD BRASS
. STUD, SHOULDERED: 0.9 38 INCH LONG, BRASS
CONNECTOR , RCPT , : BNC , FEMALE
CONNECTOR , RCPT , : BNC , FEMALE

EXTENSION SHAFT:0.081 DIA X 3.0 INCH L,SST
EXTENSION SHAFT: 3. 18 L X 0.08 OD STL
RESISTOR, VARIABLE: (SEE R468 EPL)

(ATTACHING PARTS)
NUT, PLAIN, HEX. :0. 25-32 X 0.312 INCH,BRS
WASHER,FLAT:0.25 ID X 0.375 INCH OD,STL

RESISTOR,VARIABLE: (SEE R158 EPL)

(ATTACHING PARTS)
NUT, PLAIN, HEX. :0. 25-32 X 0.312 INCH,BRS
WASHER, FLAT: 0.2 5 ID X 0.375 INCH 0D,STL

B010100 B049999

2 BUSHING, SLEEVE: PRESS MOUNT

1 BSHG,MACH.THD:HEX, 0.375-32 X 0.438"LONG

(ATTACHING PARTS)

1 NUT,PLAIN,HEX.:0.375 X 0.438INCH,STL

1 WASHER,FLAT:0.375 ID X 0.50 INCH OD STL

1 PANEL, FRONT :AM50 2

1 LCH,PLUG-IN RET:

(ATTACHING PARTS)

1 SCR,TPG,THD CTG: 2-56X0. 25 "100 DEG,FLH STL

2 BASE, LAMPHOLDER: 0.29 OD X 0.19" L,BK PLSTC
1 LENS, LIGHT: AMBER

1 LENS,LIGHT:GREEN

2 LAMPHOLDER: WHITE PLASTIC
1 SUBPANEL,FRONT:PLASTIC

80009

200-0103-00

80009

129-0077-00

24931

28JR200-1

91836

KC19-153BNC

80009

384-1221-00

80009

384-0415-01

73743

2X20319-402

79807

OBD

73743

2X20319-402

79807

OBD

80009

358-0378-00

80009

358-0029-00

73743

2X28269-402

78471

OBD

80009 333-1711-00
80009 214-1513-01

45722 OBD

80009
80009
80009

80009
80009

200-0935-00
378-0602-01
378-0602-00
352-0157-00
386-2529-00

REV. D SEPT. 1975

3-13

Mechanical Parts List— AM 502

Fig. &

Index Tektronix Serial/Model No.
No. Part No. Eff Dscont

Qty

12 3 4 5

Name & Description

Mfr
Code

Mfr Part Number

1-

386-2529-01

B050000

-38

213-0229-00

-39

337-1782-00

B010100 B049999

337-1782-01

B050000

-40

214-1061-00

-41

426-0725-00

-42

213-0146-00

-43

426-0724-00

-44

213-0146-00

-45

211-0012-00

-46

210-0406-00

-47 376-0039-00

213-0075-00

-48

-49

-50 210-1122-00
-51 210-0910-00
-52 131-0604-00
-53 136-0252-04
136-0252-04
136-0514-00
-54 200-0687-01
-55 136-0235-00
-56

-57
-58
-59

-61
-62

-63
-64
-65
-66
-67
-68
-69
-70

-71

-72
-73
-74
-75
-76
-77
-78
-79
-80

210-0583-00
210-0046-00
210-1025-00

-60 407-1337-00

B010100 B030294

B030295

B030295

211-0008-00
210-0551-00

337-1883-00
260-1207-00
361-0385-00
260-1209-00
361-0383-00
344-0154-00
384-0173-00
384-0348-01
263-1004-00

211-0116-00

200-1598-00

354-0219-00
401-0155-00
131-0840-00
214-1704-01
214-1127-00
105-0498-00
401-0156-00
210-0406-00

1 SUBPANEL, FRONT: PLASTIC

{ATTACHING PARTS)

4 SCR,TPG,THD FOR:6-20X0.375 100 DEG,FLH STL

__-* — —

1 SHLD, ELECTRICAL: FRONT SUBPANEL

1 SHLD, ELECTRICAL: FRONT SUBPANEL

1 SPRING, GROUND: FLAT

1 FR SECT, PLUG- IN: TOP

(ATTACHING PARTS)

2 SCR,TPG,THD FOR:6-20 X 0.313 INCH.PNH STL

1 FR SECT, PLUG- IN: BOTTOM

(ATTACHING PARTS)
1 SCR,TPG,THD FOR:6-20 X 0.313 INCH,PNH STL
1 SCREW, MACHINE:4-40 X 0.375 INCH,PNH STL
1 NUT, PLAIN, HEX. :4-40 X 0.188 INCH,BRS

1 CPLG, SHAFT RIGI: 0.438 INCH LONG W/SETSCREW

2 SETSCREW:4-40 X 0.094 INCH, HEX SOC STL
1 CKT BOARD ASSY : —MAIN (SEE EPL)

CRT BOARD ASSY INCLUDES:
1 TRANSISTOR: (SEE Q940 EPL)

TRANSISTOR INCLUDES:
1 WASHER, LOCK:DISHED,0. 12 ID X

1 WASHER, NONMETAL: 0.188 ID X
36 CONTACT, ELEC: CAM SWITCH
72 SOCKET PIN CON.-0.188 INCH LONG
56 SOCKET PIN CON: 0.188 INCH LONG

2 SOCKET, PLUG- IN :MICROCIRCUIT, 8 CONTACT
1 COV, TRANSISTOR:
1 SOCKET, SEMICOND: 6 PIN
1 RESISTOR, VARIABLE: (SEE R467 EPL)

(ATTACHING PARTS)
1 NUT, PLAIN, HEX:0. 25-32 X 0.312 INCH,BRS

1 WASHER, LOCK :INTL, 6. 261 ID X 0.40" OD.STL

2 WASHER, FLAT: 0.50 ID X 0.312 INCH OD,BRS

- — -*--

1 BRACKET, RES, MTG:

(ATTACHING PARTS)

2 SCREW, MACHINE: 4-40 X 0.25 INCH,PNH STL
2 NUT, PLAIN, HEX:4-40 X 0.25 INCH, STL

_ ~ — * - -

2 SHLD, ELECTRICAL:

2 SWITCH, PUSH: DOUBLE

8 SPACER, SLEEVE: GREEN, 0.164 INCH LONG

1 SWITCH , PUSH : S INGLE

2 SPACER, SLEEVE: CHARCOAL, 0.3 30 INCH LONG
4 CLIP , ELECTRICAL : FUSEHOLDER

1 EXTENSION SHAFT:6.438 INCHES LONG
1 EXTENSION SHAFT: 9. 161 INCHES LONG
1 ACTUATOR ASSY: (S470)

(ATTACHING PARTS)
4 SCR.ASSEM WSHR:4-40 X 0.312 INCH,PNH BRS

ACTUATOR ASSY INCLUDES:

1 COVER, CAM SW:

1 RING, RETAINING:

1 BEARING, CAM SW: FRONT

1 CONTACT , ELEC : GROUNDING

2 SPRING, FLAT: CAM SW DETENT, 0.008 INCH THK
2 ROLLER, DETNET: 0.125 OD X 0. 125"LONG,SST
1 DRUM, CAM SWITCH:

1 BEARING, CAM SW:REAR

4 NUT, PLAIN, HEX:4-40 X 0.187 INCH, BRS

80009 386-2529-01

83385 OBD

80009 337-1782-00

80009 337-1782-01

80009 214-1061-00

80009 407-0725-00

83385 OBD

80009 407-0724-00

83385 OBD

83385 OBD

73743 2X12161-402

80009 376-0039-00

70276 OBD

0.375"OD,STL

78189

OBD

313"OD, TEFLON

02107

1704B863

80009

131-0604-00

22526

75060-001

22526

75060-001

.'ONTACT

82647

C93802

80009

200-0687-01

71785

133-96-12-062

73743 2X20319-402

78189 1214-05-00-0541C

12327 OBD

80009 407-1337-00

83385 OBD

83385 OBD

80009
80009
80009
80009
80009
80009
80009
80009
80009

337-1883-00
260-1207-00
361-0385-00
260-1209-00
361-0383-00
344-0154-00
384-0173-00
384-0348-01
263-1004-00

83385 OBD

80009
79136
80009
80009
80009
80009
80009
80009
73743

200-1598-00

5103-25-MD-R

401-0155-00

131-0840-00

214-1704-01

214-1127-00

105-0498-00

401-0156-00

2X12161-402

3-14

REV. C SEPT. 1975

Mechanical Parts List— AM 502

Fig. &

Index Tektronix Serial/Model No.
No. Part No. Eff Dscont

Qty

12 3 4 5

Name & Description

Mfr
Code Mfr Part Number

1-

263-1003-00

-81 211-0116-00

•82

200-1597-00

■83

354-0219-00

•84

401-0155-00

■85

131-1248-00

•86

214-1704-00

•87

214-1704-01

■88

214-1127-00

•89

105-0502-00

•90

401-0156-00

•91

210-0406-00

263-1005-00

■92

211-0116-00

-93

200-1596-00

•94

211-0008-00

-95

210-0004-00

-96

210-0406-00

-97

131-0963-00

-98

354-0391-00

-99

401-0081-02

-100

214-1139-03

-101

214-1139-02

-102

214-1127-00

-103

105-0503-00

-104

401-0115-00

210-0406-00

131-0963-00

-105

384-1220-00

-106

376-0029-00

-107

213-0075-00

-108
-109
-110

-111
-112
-113
-114
-115

210-0583-00
210-0046-00
407-0803-00

175-0825-00
175-0826-00
131-0707-00
352-0162-02
179-2028-00

1 ACTUATOR ASSY: (S490)

(ATTACHING PARTS)

4 SCR,ASSEM WSHR:4-40 X 0.312 INCH,PNH BRS

ACTUATOR ASSY INCLUDES:

1 COVER, CAM SW:

1 RING, RETAINING:

1 BEARING, CAM SW: FRONT

1 CONTACT, ELEC: GROUNDING

1 SPRING, FLAT: CAM SW DETENT, 0.006 INCH THK

1 SPRING, FLAT: CAM SW DETENT, 0.008 INCH THK

2 ROLLER DETENT:0.125 OD X 0.125"LONG,SST
1 DRUM, CAM SWITCH:

1 BEARING, CAM SW:REAR

4 NUT, PLAIN, HEX:4-40 X 0.187 INCH, BRS

1 ACTUATOR ASSY: (S480)

(ATTACHING PARTS)

4 SCR,ASSEM WSHR:4-40 X 0.312 INCH,PNH BRS

ACTUATOR ASSY INCLUDES:

1 COVER, CAM SW:

(ATTACHING PARTS)

4 SCREW,MACHINE:4-40 X 0.25 INCH,PNH STL

4 WASHER, LOCK :INTL, 0.12 ID X 0.26"OD,STL

3 NUT, PLAIN, HEX: 4-40 X 0.188 INCH, BRS
1 CONTACT , ELEC : GROUND ING

1 RING, RETAINING:

1 BEARING, CAM SW: FRONT

1 SPRING, FLAT: CAM SW DETENT, 0.010 INCH THK

1 SPRING, FLAT: CAM SW DETENT, 0.008 INCH THK

2 ROLLER, DETENT: 0.125 OD X 0.125"LONG,SST
1 DRUM, CAM SWITCH:

1 BEARING, CAM SW:REAR

3 NUT, PLAIN, HEX:4-40 X 0.188 INCH,BRS
1 CONTACT , ELEC : GROUND ING

1 EXTENSION SHAFT: 8. 038 INCHES LONG

1 CPLG, SHAFT, RIGI:

2 SETSCREW:4-40 X 0.094 INCH, HEX SOC STL
1 RESISTOR,VARIABLE:(SEE R178/S178 EPL)

(ATTACHING PARTS)

1 NUT, PLAIN, HEX:0. 25-32 X 0.312 INCH, BRS

1 WASHER, LOCK:INTL, 0.261 ID X 0.40"OD,STL

1 BRACKET, RES MTG:

FT WIRE,ELECTRICAL:2 WIRE RIBBON

FT WIRE,ELECTRICAL:3 WIRE RIBBON

4 CONNECTOR, TERM: 0.50 INCH LONG (22-26 AWG)
1 HOLDER, TERM CON:4 WIRE (RED)

1 WIRING HARNESS: MAIN

80009

263-1003-00

83385

OBD

80009

200-1597-00

79136

5103-25-MD-R

80009

401-0155-00

80009

131-1248-00

80009

214-1704-00

80009

214-1704-01

80009

214-1127-00

80009

105-0502-00

80009

401-0156-00

73743

2X12161-402

80009

263-1005-00

83385

OBD

80009 200-1596-00

83385 OBD

78189 12O4-OO-00-0541C

73743 2X12161-402

80009 131-0963-00

97464
80009
80009
80009
80009
80009
80009
73743
80009
80009
80009
70276

3100-43-CD

401-0081-02

214-1139-03

214-1139-02

214-1127-00

105-0503-00

401-0115-00

2X12161-402

131-0963-00

384-1220-00

376-0029-00

OBD

73743 2X20319-402

78189 1214-05-00-0541C

80009 407-0803-00

23499 TEK-175-0825-00

23499 TEK-175-0826-00

22526 47439

80009 352-0162-02

80009 179-2028-00

REV. A SEPT. 1975

3-15

+

+'

®

AM 502

+

ACCESSORIES

REPACKAGING

Fig. &
Index

No.

Tektronix
Part No.

Serial/Model No.
Eff Dscont

Qty

12 3 4 5

Name & Description

Mfr
Code Mfr Part Number

070-1582-00

1 MANUAL, INSTRUCTION

80009 070-1582-00

Fig. &

Index

No.

Tektronix
Part No.

Serial/Model No.
Eff Dscont

Qty

12 3 4 5

Name & Description

Mfr
Code Mfr Part Number

-1
-2
-3
-4
-5

065-0151-00

004-0282-00
004-0243-00
004-0242-00

004-1093-00
004-0612-00

1 CARTON ASSEMBLY:

CARTON ASSEMBLY INCLUDES:

2 FRAME : PLASTIC FOAM

1 PAD,CUSHIONING:FRONT

1 PAD, CUSHIONING :REAR

1 PAD,CUSHIONING:13.375 X 3.25 X 5.625"

1 CARTON:16.50 X 6.625 X 9.125 INCHES

80009 065-0151-00

80009
80009
80009
80009
80009

004-0282-00
004-0243-00
004-0242-00
004-1093-00
004-0612-00

AM 502

S-